US4707515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture-curable sealant compositions
Assignee: Bostik Inc
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Filing: 1986-04-11
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Granted: 1987-11-17
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Expires: 2006-04-11
Abstract
Abstract The specification is concerned with sealant compositions comprising prepolymers which are capable of being cured by atmospheric moisture. The compositions provide a desirable blend of properties with regard to application and use, using prepolymers derived from comparatively inexpensive raw materials. The prepolymers correspond to a reaction product of an at least substantially linear acrylate ester polymer having a Tg of not greater than 10 DEG C. with a hydrolysable silane having a saturated organo-functional group, the reaction product being a fluid material soluble in organic solvents and curable by exposure to atmospheric moisture to a resilient solid. The prepolymer is a silane-modified polymer which preferably has from 2 to 3 hydrolysable silane groups per molecule of prepolymer and from 1 to 3 hydrolysable groups per silane group. Preferred acrylate ester polymers are homo- or co-polymers of butyl acrylate; copolymers may contain other acrylate monomers and or may contain up to 50 wt % vinyl monomer e.g. styrene. Preferred silanes are amino-silanes particularly those having 2 or 3 hydrolysable alkoxy groups. Also described and claimed are methods of making the prepolymers. The compositions are suited for construction and glazing sealants.
Inventors
- 👤 Heinz G. Gilch
- 👤 Wolfgang Haar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:57
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C08; C08F; C08F8/00; C08F8/42; C09J; C09J143/00; C09J143/04; C09K2003/1034; C09K2003/1056; C09K2200/00; C09K2200/04; C09K2200/0494; C09K2200/06; C09K2200/0615; C09K2200/0625
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
169 words
A flowable sealant composition comprising a fluid prepolymer material corresponding to a condensation reaction product of an at least substantially linear alkyl acrylate ester polymer comprising a homopolymer of n-butylacrylate, or a copolymer of n-butylacrylate with ethyl hexylacrylate or methylacrylate or styrene or with methylacrylate and styrene wherein said copolymer comprises not less than 70% by weight n-butylacrylate, said acrylate ester polymer having a viscosity in the range of about 50 to about 2,000 Pas determined using an 80% solution in xylene at 23° C. and a glass-transition temperature (DSC measurment method) of less than -15° C. with a hydrolysable silane having a saturated organo functional group reactive with ester groups of the polymer, said hydrolysable silane comprising one or more of γ-amino propyl triethoxysilane, γ-amino propyl trimethoxysilane and γ-amino propyl methyl diethoxysilane, the acrylate ester polymer and silane being selected and used in quantities to provide a fluid prepolymer material which is soluble as defined and which is curable by exposure to atmospheric moisture to a resilient solid.
Claim 2
Dependent Claim
169 words
A flowable sealant composition comprising a fluid prepolymer material corresponding to a condensation reaction product of an at least substantially linear alkyl acrylate ester polymer comprising a homopolymer of n-butylacrylate, or a copolymer of n-butylacrylate with ethyl hexylacrylate or methylacrylate or styrene or with methylacrylate and styrene wherein said copolymer comprises not less than 70% by weight n-butylacrylate, said acrylate ester polymer having a viscosity in the range of about 50 to about 2,000 Pas determined using an 80% solution in xylene at 23° C. and a glass-transition temperature (DSC measurment method) of less than -15° C. with a hydrolysable silane having a saturated organo functional group reactive with ester groups of the polymer, said hydrolysable silane comprising one or more of γ-amino propyl triethoxysilane, γ-amino propyl trimethoxysilane and γ-amino propyl methyl diethoxysilane, the acrylate ester polymer and silane being selected and used in quantities to provide a fluid prepolymer material which is soluble as defined and which is curable by exposure to atmospheric moisture to a resilient solid.
Claim 3
Dependent Claim
24 words
A composition according to claim 1 wherein the acrylate ester polymer has a number average molecular weight (Mn) between about 5,000 and about 100,000.
Claim 4
Dependent Claim
23 words
A composition according to claim 1 wherein the acrylate ester polymer has a number average molecular weight between about 20,000 and about 40,000.
Claim 5
Dependent Claim
25 words
A composition according to claim 1 wherein the acrylate ester polymer has a weight average molecular weight in the range about 100,000 to about 300,000.
Claim 6
Dependent Claim
34 words
A composition according to claim 1 wherein the acrylate ester polymer has a viscosity in the range about 150 to about 750 Pas as determined using an 80% solution in xylene at 23° C.
Claim 7
Independent Claim
169 words
A method of making a prepolymer having hydrolysable silane groups attached to the prepolymer chain and suitable for use in a sealant composition comprising reacting a substantially linear alkyl acrylate ester polymer comprising a homopolymer of n-butylacrylate, or a copolymer of n-butylacrylate with ethyl hexylacrylate or methylacrylate or styrene or with methylacrylate and styrene wherein said copolymer comprises not less than 70% by weight n-butylacrylate, said acrylate ester polymer having a viscosity in the range of about 50 to about 2,000 Pas determined using an 80% solution in xylene at 23° C. and a glass transition temperature (DSC measurement method) of less than -15° C. with a hydrolysable amino silane which comprises one or more of γ-amino propyl triethoxysilane, γ-amino propyl trimethoxysilane and γ-amino propyl methyl diethoxysilane in solution which alkyl acrylate ester polymer is dried prior to addition of the amino silane by heating in presence of an alkoxy silane to a water content of less than 100 ppm water in presnece of a catalyst and a solvent.
Claim 8
Independent Claim
169 words
A method of making a prepolymer having hydrolysable silane groups attached to the prepolymer chain and suitable for use in a sealant composition comprising reacting a substantially linear alkyl acrylate ester polymer comprising a homopolymer of n-butylacrylate, or a copolymer of n-butylacrylate with ethyl hexylacrylate or methylacrylate or styrene or with methylacrylate and styrene wherein said copolymer comprises not less than 70% by weight n-butylacrylate, said acrylate ester polymer having a viscosity in the range of about 50 to about 2,000 Pas determined using an 80% solution in xylene at 23° C. and a glass transition temperature (DSC measurement method) of less than -15° C. with a hydrolysable amino silane which comprises one or more of γ-amino propyl triethoxysilane, γ-amino propyl trimethoxysilane and γ-amino propyl methyl diethoxysilane in solution which alkyl acrylate ester polymer is dried prior to addition of the amino silane by heating in presence of an alkoxy silane to a water content of less than 100 ppm water in presnece of a catalyst and a solvent.
Claim 9
Dependent Claim
24 words
A method according to claim 6, wherein the acrylate ester polymer has a number average molecular weight (Mn) between about 5,000 and about 100,000.
Claim 10
Dependent Claim
23 words
A method according to claim 6, wherein the acrylate ester polymer has a number average molecular weight between about 20,000 and about 40,000.
Claim 11
Dependent Claim
21 words
A method according to claim 6, wherein the catalyst comprises dibutyl tin dilaurate, dibutyl tin diacetate, a titanate or a zirconate.
Claim 12
Dependent Claim
25 words
A method according to claim 6, wherein the reaction is carried out in presence of a reaction product of dibutyl tin diacetate and tetramethyoxy silane.
Claim 13
Dependent Claim
10 words
A prepolymer made by a method according to claim 6.
Claim 14
Dependent Claim
17 words
A sealant composition comprising a prepolymer which is the product of a method according to claim 6.
Claim 15
Dependent Claim
11 words
A sealant composition according to claim 1, comprising a condensation catalyst.
Claim 16
Dependent Claim
16 words
A sealant composition according to claim 1, comprising 0 to 90% by weight finely divided filler.
Claim 17
Dependent Claim
20 words
A sealant composition according to claim 1, comprising about 0.05 to about 10% by weight of a silane adhesion promoter.
Claim 18
Dependent Claim
33 words
A sealant composition according to claim 1, comprising 55 to 75 parts by weight prepolymer, 20 to 30 parts by weight of ester plasticiser, and 5 to 15 parts by weight fumed silica.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-16 | 1991-05-18 | 1991-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-16 | 1995-05-18 | 1995-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-16 | 1999-05-18 | 1999-11-17 | $7700.00 | Window Closed / Lapsed |