Patent US5017919A successfully refreshed from Google Patents.
US3963801A
Expired / Lapsed
US
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Blends of copolyesters, ethylene/carboxylic acid copolymers and a polycarbodiimide
Assignee: EIDP Inc
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Filing: 1975-05-23
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Granted: 1976-06-15
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Expires: 1995-05-23
Abstract
Abstract Copolyesters blended with ethylene/carboxylic acid copolymers and a polycarbodiimide have increased melt strength, and are more readily processable by blow molding and extrusion film blowing techniques. The blends contain up to 20% by weight of the ethylene/acid copolymer. The acid groups may be partially neutralized to a level of about 10%.
Inventors
- 👤 Aaron Chung Liong Su
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:59
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02; C08L67/025
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
233 words
A blend containing 80 to 99.8% by weight of a copolyester consisting essentially of recurring intralinear long chain ester units and short chain ester units randomly joined head-to-tail through ester linkages, the long chain ester units being represented by the formula ##EQU4## and the short chain ester units being represented by the formula ##EQU5## where G is a divalent radical remaining after the removal of terminal hydroxyl groups from at least one long chain glycol having a molecular weight of about 400-6000; R is a divalent radical remaining after removal of carboxyl groups from at least one dicarboxylic acid having a molecular weight less than about 300; and D is a divalent radical remaining after removal of hydroxyl group from at least one low molecular weight diol having a molecular weight of less than 250, said short chain ester units being present in the polyester to the extent of between about 15 and 95% by weight of the polyester, and 0.2 to 20% by weight of a copolymer containing ethylene units and carboxylic acid containing units, said copolymer containing between about 25 and 98.5% by weight ethylene units, and about 1.5 and 30% by weight carboxylic acid containing units, said carboxylic acid units being from 0 to 10% neutralized with metallic ions, said blend also containing at least one substantially linear polycarbodiimide, said blend having a melt tension of at least 0.4 gm.
Claim 2
Dependent Claim
233 words
A blend containing 80 to 99.8% by weight of a copolyester consisting essentially of recurring intralinear long chain ester units and short chain ester units randomly joined head-to-tail through ester linkages, the long chain ester units being represented by the formula ##EQU4## and the short chain ester units being represented by the formula ##EQU5## where G is a divalent radical remaining after the removal of terminal hydroxyl groups from at least one long chain glycol having a molecular weight of about 400-6000; R is a divalent radical remaining after removal of carboxyl groups from at least one dicarboxylic acid having a molecular weight less than about 300; and D is a divalent radical remaining after removal of hydroxyl group from at least one low molecular weight diol having a molecular weight of less than 250, said short chain ester units being present in the polyester to the extent of between about 15 and 95% by weight of the polyester, and 0.2 to 20% by weight of a copolymer containing ethylene units and carboxylic acid containing units, said copolymer containing between about 25 and 98.5% by weight ethylene units, and about 1.5 and 30% by weight carboxylic acid containing units, said carboxylic acid units being from 0 to 10% neutralized with metallic ions, said blend also containing at least one substantially linear polycarbodiimide, said blend having a melt tension of at least 0.4 gm.
Claim 3
Dependent Claim
16 words
The blend of claim 1 in which the ethylene copolymer also contains polymerized methyl acrylate units.
Claim 4
Dependent Claim
25 words
The blend of claim 2 in which the methyl acrylate units are present to the extent of about 50-60 weight percent of the ethylene copolymer.
Claim 5
Dependent Claim
20 words
The blend of claim 1 in which the ethylene copolymer contains 2 to 16% by weight carboxylic acid containing units.
Claim 6
Dependent Claim
16 words
The blend of claim 4 in which the carboxylic acid containing units are ethyl hydrogen maleate.
Claim 7
Dependent Claim
27 words
The blend ofl claim 1 in which the short chain ester units of the copolyester component amount to about 23 to 85% by weight of the copolyester.
Claim 8
Dependent Claim
111 words
The blend of claim 1 in which the polycarbodiimide has the formula X 1 --R 1 [N=C=N--R 2 ] n N=C=N--R 3 --X 2 where R 1 , R 2 and R 3 are C 1 -C 12 aliphaic, C 6 -C 15 cycloaliphatic, or C 6 -C 15 aromatic divalent hydrocarbon radicals and combinations thereof, X 1 and X 2 are ##EQU6## where R 4 , R 5 and R 6 are C 1 -C 12 aliphatic, C 5 -C 15 cycloaliphatic and C 6 -C 15 aromatic monovalent hydrocarbon radicals and combinations thereof and additionally R 4 and R 5 can be hydrogen, and n is at least 2.
Claim 9
Dependent Claim
25 words
The blend of claim 7 in which the polycarbodiimide is present in the amount of about 0.2 to 30 percent by weight of the copolyester.
Claim 10
Dependent Claim
30 words
The blend of claim 1 in which the copolyester has an inherent viscosity at a concentration of 0.1 gm./dl in meta cresol at 30°C. of between about 0.75 and 1.7.
Claim 11
Dependent Claim
27 words
The blend of claim 9 in which the ethylene containing copolymer contains polymerized methyl acrylate units and the carboxylic acid containing polymerized units are ethyl hydrogen maleate.
Claim 12
Dependent Claim
30 words
The blend of claim 9 in which a portion of the acid groups on the ethylene copolymer are neutralized with alkali metal ions, alkaline earth metal ions, or zince ions.
Claim 13
Dependent Claim
17 words
The blend of claim 9 in which the ethylene containing copolymer contains isobutyl acrylate and methacrylic acid.
References Cited (Backward Citations)
US3435093A
Cited
US3835098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |