US4433117A
Expired / Lapsed
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Copolyesteramide and production of the same
Assignee: Kuraray Co Ltd
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Filing: 1983-03-08
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Granted: 1984-02-21
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Expires: 2003-03-08
Abstract
Abstract A copolymer having high strength and high elastic modulus is produced by copolymerizing (a) a polyamide oligomer prepared from a piperazine compound and an aromatic dicarboxylic acid and (b) a polyalkylene terephthalate monomer or a prepolymer thereof. The copolymer is useful as a rubber reinforcing fiber, a magnetic tape base film, and a coating material.
Inventors
- 👤 Motowo Takayanagi
- 👤 Yoshihumi Murata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:36
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/44
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
88 words
A random block copolyesteramide comprising 0.05 to 20 wt% of polyamide blocks composed of amide units represented by the formula (I) ##STR8## (where R 1 and R 2 are hydrogen or a methyl group) and 99.95 to 80 wt% of polyester blocks composed of ester units represented by the formula (II) ##STR9## (where n is an integer of 2 to 4), said copolyesteramide having an intrinsic viscosity higher than 0.5, and the average number of the consecutive repeating amide units in said polyamide blocks being 2 to 40.
Claim 2
Dependent Claim
88 words
A random block copolyesteramide comprising 0.05 to 20 wt% of polyamide blocks composed of amide units represented by the formula (I) ##STR8## (where R 1 and R 2 are hydrogen or a methyl group) and 99.95 to 80 wt% of polyester blocks composed of ester units represented by the formula (II) ##STR9## (where n is an integer of 2 to 4), said copolyesteramide having an intrinsic viscosity higher than 0.5, and the average number of the consecutive repeating amide units in said polyamide blocks being 2 to 40.
Claim 3
Dependent Claim
29 words
A copolymer as set forth in claim 1, wherein at least 30 mol% of the dicarboxylic acid residues of the polyamide blocks are isophthalic acid and/or orthophthalic acid residues.
Claim 4
Dependent Claim
21 words
A copolymer as set forth in claim 1, wherein the dicarboxylic acid residues of the polyamide blocks are terephthalic acid residues.
Claim 5
Dependent Claim
25 words
A copolymer as set forth in claim 3, wherein the average number of consecutive repeating amide units in the polyamide blocks is 2 to 5.
Claim 6
Dependent Claim
33 words
A copolymer as set forth in claim 1, wherein more than 30 mol% of the dicarboxylic acid residues of the polyamide blocks are isophthalic acid residues and the balance are terephthalic acid residues.
Claim 7
Dependent Claim
23 words
A copolymer as set forth in claim 1, wherein the polyamide blocks contribute 0.1 to 5 wt.% of the weight of the copolymer.
Claim 8
Dependent Claim
23 words
A copolymer as set forth in claim 1, wherein the polyamide blocks contribute 0.2 to 2 wt% of the weight of the copolymer.
Claim 9
Dependent Claim
19 words
A copolymer as set forth in claim 1, wherein the diamine residues of the polyamide blocks are piperazine residues.
Claim 10
Dependent Claim
19 words
A copolymer as set forth in claim 1, wherein the diamine residues of the polyamide blocks are dimethylpiperazine residues.
Claim 11
Dependent Claim
21 words
A copolymer as set forth in claim 1, wherein the n of the diol residues of the polyester blocks is 2.
Claim 12
Dependent Claim
74 words
A process for producing a copolyesteramide which comprises dissolving a polyamide oligomer having the repeating unit represented by the formula (I) and having an average degree of polymerization of 2 to 40, ##STR10## (where R 1 and R 2 are hydrogen or a methyl group) in a polyester monomer or a prepolymer thereof represented by the formula (III), ##STR11## (where n is an integer of 2 to 4) and subsequently performing a polycondensation reaction.
Claim 13
Dependent Claim
74 words
A process for producing a copolyesteramide which comprises dissolving a polyamide oligomer having the repeating unit represented by the formula (I) and having an average degree of polymerization of 2 to 40, ##STR10## (where R 1 and R 2 are hydrogen or a methyl group) in a polyester monomer or a prepolymer thereof represented by the formula (III), ##STR11## (where n is an integer of 2 to 4) and subsequently performing a polycondensation reaction.
Claim 14
Dependent Claim
33 words
A process for producing a copolymer as set forth in claim 11, wherein at least 30 mol% of the dicarboxylic acid residues of the polyamide oligomer are isophthalic acid and/or orthophthalic acid residues.
Claim 15
Dependent Claim
25 words
A process for producing a copolymer as set forth in claim 11, wherein the dicarboxylic acid residues of the polyamide oligomer are terephthalic acid residues.
Claim 16
Dependent Claim
77 words
A process for producing a copolymer as set forth in claim 13, wherein the polyamide oligomer is one in which at least 50% of the terminals of the molecular chains have phenol derivative residues represented by the formula (IV) ##STR12## (where either of R 3 or R 4 is an alkyl group of carbon number 3 to 5 and the other is hydrogen; and R 5 is hydrogen, a lower alkyl group, or a lower alkoxy group).
Claim 17
Dependent Claim
26 words
A process for producing a copolymer as set forth in claim 14, wherein the polyamide oligomer has an average degree of polymerization of 2 to 5.
Claim 18
Dependent Claim
27 words
A process for producing a copolymer as set forth in claim 14, wherein R 3 is a tert-butyl group, and R 4 and R 5 are hydrogen.
Claim 19
Dependent Claim
37 words
A process for producing a copolymer as set forth in claim 11, wherein more than 30 mol% of the dicarboxylic acid residues of the polyamide oligomer are isophthalic acid residues and the balance are terephthalic acid residues.
Claim 20
Dependent Claim
17 words
A resin composition which comprises a polyalkylene terephthalate and a copolyesteramide as set forth in claim 1.
Claim 21
Dependent Claim
37 words
A resin composition as set forth in claim 18, wherein the copolyesteramide is blended in such an amount that the polyamide blocks of the copolyesteramide contribute 0.05 to 20 wt% of the total weight of the resin.
Claim 22
Dependent Claim
11 words
A fiber produced from the copolyesteramide set forth in claim 1.
Claim 23
Dependent Claim
12 words
A fiber produced from the resin composition set forth in claim 18.
Claim 24
Dependent Claim
11 words
A film produced from the copolyesteramide set forth in claim 1.
Claim 25
Dependent Claim
12 words
A film produced from the resin composition set forth in claim 18.
Claim 26
Dependent Claim
11 words
A coating material comprising the copolyesteramide set forth in claim 1.
Claim 27
Dependent Claim
12 words
A coating material comprising the resin composition set forth in claim 18.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |