US5356706A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Release coating for adhesive tapes and labels
Assignee: 3M Co
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Filing: 1992-12-14
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Granted: 1994-10-18
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Expires: 2012-12-14
Abstract
Abstract An alkali dispersible copolymer is provided which is the reaction product of a di-omegaorgano functional dimethylsiloxane oligomer having terminal active hydrogen groups, a carboxyl group bearing monomer, and a diisocyanate. The copolymer provides good release per se from tacky adhesive masses or when combined with other film formers.
Inventors
- 👤 A. Andrew Shores
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0819; C08G18/28; C08G18/40; C08G18/61; C08G77/00; C08G77/42; C09; C09D; C09D183/00; C09D183/10; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
209 words
A process for manufacturing a pressure sensitive adhesive tape or label comprising the steps of i. providing an isocyanate terminated prepolymer comprising the reaction product of a composition comprising in admixture: A. a di-omegaorganofunctional dimethylsiloxane oligomer represented by the formula: ##STR4## wherein n=2-200, R is a simple divalent aliphatic hydrocarbon radical, and X is an active Hydrogen containing radical selected from the group consisting of a. --SH, b. --NHR, wherein R is H or simple alkyl, and c. --O--CH 2 CHR 4 O-- p H, wherein R 4 is H or CH 3 and p=0-100; B. an aromatic or aliphatic diisocyanate, C. a carboxyl containing diol of the general formula ##STR5## wherein R is a trivalent or tetravalent radical with 4-16 carbon atoms, m=1 or 2, and optionally D. an organic monomer having 2 active Hydrogens selected from the group consisting of --OH, --SH, --NH, --NH-Alkyl ii. chain extending said prepolymer with an aliphatic primary or secondary diamine and solubilizing the copolymer formed in water, with a tertiary amine; iii. coating a backing member with a solution comprising a major proportion of water and a minor proportion of said copolymer; iiii. removing the water from the backing by heat and iiiii. coating the backing with a pressure sensitive adhesive.
Claim 2
Dependent Claim
209 words
A process for manufacturing a pressure sensitive adhesive tape or label comprising the steps of i. providing an isocyanate terminated prepolymer comprising the reaction product of a composition comprising in admixture: A. a di-omegaorganofunctional dimethylsiloxane oligomer represented by the formula: ##STR4## wherein n=2-200, R is a simple divalent aliphatic hydrocarbon radical, and X is an active Hydrogen containing radical selected from the group consisting of a. --SH, b. --NHR, wherein R is H or simple alkyl, and c. --O--CH 2 CHR 4 O-- p H, wherein R 4 is H or CH 3 and p=0-100; B. an aromatic or aliphatic diisocyanate, C. a carboxyl containing diol of the general formula ##STR5## wherein R is a trivalent or tetravalent radical with 4-16 carbon atoms, m=1 or 2, and optionally D. an organic monomer having 2 active Hydrogens selected from the group consisting of --OH, --SH, --NH, --NH-Alkyl ii. chain extending said prepolymer with an aliphatic primary or secondary diamine and solubilizing the copolymer formed in water, with a tertiary amine; iii. coating a backing member with a solution comprising a major proportion of water and a minor proportion of said copolymer; iiii. removing the water from the backing by heat and iiiii. coating the backing with a pressure sensitive adhesive.
Claim 3
Dependent Claim
32 words
Process according to claim 1 wherein R is --CH 2 CH 2 CH 2 --, and n is about 14 and X is --O(CH 2 CH 2 O) p H, wherein p=0-30.
Claim 4
Dependent Claim
10 words
Process according to claim 1 wherein said diisocyanate is aromatic.
Claim 5
Dependent Claim
29 words
Process according to claim 1 wherein said diisocyanate is selected from the group consisting of isomers of toluene diisocyanate, isomores of methylene-bis-phenylisocyanate, hexamethylene diisocyanate, isophorone diisocyanate and hydrogenated methylene-bis-phenylisocyanate.
Claim 6
Dependent Claim
15 words
Process according to claim 1 wherein said diol is 2,2'-dimethylol propionic acid or tartaric acid.
Claim 7
Dependent Claim
13 words
Process according to claim 1 wherein said optional organic monomer is a diol.
Claim 8
Dependent Claim
26 words
Process according to claim 1 wherein said diamine is selected from the group consisting of isophorone diamine, amino-teminated polyether, menthane diamine, aminoethylpiperazine, polymethylene diamine, xylylene diamine.
Claim 9
Dependent Claim
135 words
Process according to claim 1 wherein the prepolymer is the reaction product of a composition comprising in admixture: A. a di-omegaorganofunctional dimethylsiloxane oligomer represented by the formula: ##STR6## wherein n is about 14, R is --CH 2 CH 2 CH 2 --and X is --O(CH 2 CH 2 O) p --H, wherein p=0-30, B. a diisocyanate selected from the group consisting of isomers of toluene diicyanate, isomers of methylene-bis-phenylisocyanate, isomers of hydrogenated methylene-bis-phenylisocyanate and isophorone diisocyanate, C. 2,2'-dimethylol propionic acid or tartaric acid, and optionally D. a diol selected from the group consisting of butanediol, triethylene glycol, polyether diol and polyester diol; and said prepolymer is chain extended in water, in the presence of a tertiary amine, with a diamine selected from the group consisting of polyether diamine, isophorone diamine, polyalkylene diamine and xylylene diamine.
Claim 10
Dependent Claim
42 words
Process according to claim 8, wherein the integer p of siloxane olygomer is 7 or 14, a diol of group D is part of the reaction mixture, the polydimethylsiloxane block content is 10-45% and the carboxyl content of the copolymer is 1.5-8%.
Claim 11
Dependent Claim
32 words
Process according to claim 1 comprising the additional step, following chain extension, of mixing a minor amount of said copolymer with a major amount of a film former polymer dispersed in water.
Claim 12
Dependent Claim
30 words
Process according to claim 10 wherein said film former is selected from the group consisting of polyvinylchloride, polyacrylates, polyesters, epoxies, vinyl acetate and a copolymers of vinyl acetate with ethylene.
Claim 13
Dependent Claim
201 words
A process for manufacturing a pressure sensitive adhesive tape comprising the steps of: i. providing an alkali soluble urethane-siloxane copolymer comprising the reaction product of a composition comprising in admixture: A. a di-omegaorganofunctional dimethylsiloxane oligomer represented of the formula ##STR7## wherein n=2-200, R is simple divalent aliphatic hydrocarbon radical, and X is an active Hydrogen containing radical selected from the group consisting of a. --SH, b. --NHR, wherein R is H or simple alkyl, and c. --O--CH 2 CHR 4 O-- p H, wherein R 4 is H or CH 3 and p=0-100; B. an aromatic or aliphatic diisocyanate, C. an organic monomer with 1 or 2 carboxyl group and 2 active Hydrogen selected from the group consisting of --OH, --SH, --NH 2 and --NH-Alkyl, and optionally D. an organic monomer having 2 active Hydrogens selected from the group consisting of --OH, --SH, --NH 2 and --NH-Alkyl; and solubilizing said copolymer in water with a tertiary amine, ii. coating a backing member with a solution comprising a major proportion of water and a minor proportion of said copolymer, iii. removing the water from the backing by heat and iiii. coating the other side of the backing with a pressure sensitive adhesive.
Claim 14
Dependent Claim
201 words
A process for manufacturing a pressure sensitive adhesive tape comprising the steps of: i. providing an alkali soluble urethane-siloxane copolymer comprising the reaction product of a composition comprising in admixture: A. a di-omegaorganofunctional dimethylsiloxane oligomer represented of the formula ##STR7## wherein n=2-200, R is simple divalent aliphatic hydrocarbon radical, and X is an active Hydrogen containing radical selected from the group consisting of a. --SH, b. --NHR, wherein R is H or simple alkyl, and c. --O--CH 2 CHR 4 O-- p H, wherein R 4 is H or CH 3 and p=0-100; B. an aromatic or aliphatic diisocyanate, C. an organic monomer with 1 or 2 carboxyl group and 2 active Hydrogen selected from the group consisting of --OH, --SH, --NH 2 and --NH-Alkyl, and optionally D. an organic monomer having 2 active Hydrogens selected from the group consisting of --OH, --SH, --NH 2 and --NH-Alkyl; and solubilizing said copolymer in water with a tertiary amine, ii. coating a backing member with a solution comprising a major proportion of water and a minor proportion of said copolymer, iii. removing the water from the backing by heat and iiii. coating the other side of the backing with a pressure sensitive adhesive.
Claim 15
Dependent Claim
154 words
A pressure sensitive adhesive tape comprising a backing member, a pressure sensitive adhesive on the front side thereof, and a release agent of the backside thereof, said release agent comprises the reaction product of a composition comprising in admixture: A. a di-omegaorganofunctional dimethylsiloxane oligomer represented by the formula ##STR8## wherein n=2-200, R is simple divalent aliphatic hydrocarbon radical, and X is an active Hydrogen containing a radical selected from the group consisting of a. --SH, b. --NHR, wherein R is H or simple alkyl, and c. --O(CH 2 CHRO) p --H, wherein R 4 is H or CH 3 and p=0-100; B. an aromatic or aliphatic diisocyanate, C. an organic monomer with 1 or 2 carboxyl group and 2 active Hydrogen selected from the group consisting of --OH,--SH, --NH 2 and --NH-Alkyl, and optionally D. an organic monomer having 2 active Hydrogen selected from the group consisting of --OH, --SH, --NH 2 and --NH-Alkyl.
Claim 16
Dependent Claim
154 words
A pressure sensitive adhesive tape comprising a backing member, a pressure sensitive adhesive on the front side thereof, and a release agent of the backside thereof, said release agent comprises the reaction product of a composition comprising in admixture: A. a di-omegaorganofunctional dimethylsiloxane oligomer represented by the formula ##STR8## wherein n=2-200, R is simple divalent aliphatic hydrocarbon radical, and X is an active Hydrogen containing a radical selected from the group consisting of a. --SH, b. --NHR, wherein R is H or simple alkyl, and c. --O(CH 2 CHRO) p --H, wherein R 4 is H or CH 3 and p=0-100; B. an aromatic or aliphatic diisocyanate, C. an organic monomer with 1 or 2 carboxyl group and 2 active Hydrogen selected from the group consisting of --OH,--SH, --NH 2 and --NH-Alkyl, and optionally D. an organic monomer having 2 active Hydrogen selected from the group consisting of --OH, --SH, --NH 2 and --NH-Alkyl.
Claim 17
Dependent Claim
147 words
A pressure sensitive adhesive tape comprising a backing member, a pressure sensitive adhesive on the front side thereof, and a release agent on the backside thereof, said release agent is an alkali soluble linear block copolymer of the general recurring formula: ##STR9## wherein X is a divalent radical selected from the group consisting of --S--, --NH--, >N-Alkyl, --O(CH 2 CHR 4 O) p --, wherein R 4 is H or CH 3 and p=0-100, R is a simple divalent aliphatic radical, R 1 is a divalent aliphatic or aromat divalent radical, R 2 is a tri or tetravalent radical with 4 or more carbon atoms, R 3 is a divalent radical with 2 or more carbon atoms, n=2-200, m=1 or 2, a, b, and c are integers chosen as to obtain said copolymer with polydimethylsiloxane block content of at least 0.5% carboxyl content of 1-12% and c/(a+b)=0-0.5.
Claim 18
Dependent Claim
147 words
A pressure sensitive adhesive tape comprising a backing member, a pressure sensitive adhesive on the front side thereof, and a release agent on the backside thereof, said release agent is an alkali soluble linear block copolymer of the general recurring formula: ##STR9## wherein X is a divalent radical selected from the group consisting of --S--, --NH--, >N-Alkyl, --O(CH 2 CHR 4 O) p --, wherein R 4 is H or CH 3 and p=0-100, R is a simple divalent aliphatic radical, R 1 is a divalent aliphatic or aromat divalent radical, R 2 is a tri or tetravalent radical with 4 or more carbon atoms, R 3 is a divalent radical with 2 or more carbon atoms, n=2-200, m=1 or 2, a, b, and c are integers chosen as to obtain said copolymer with polydimethylsiloxane block content of at least 0.5% carboxyl content of 1-12% and c/(a+b)=0-0.5.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |