Patent US4238574A successfully refreshed from Google Patents.
US4238574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of thermoplastic polyurethane elastomers and ethylene/carboxylic acid copolymers for blow molding
Assignee: Wyeth Holdings LLC
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Filing: 1979-03-26
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Granted: 1980-12-09
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Expires: 1999-03-26
Abstract
Abstract Blends of thermoplastic polyurethane elastomers and neutralized ethylene/carboxylic acid copolymers which are useful for blow-molding applications, are disclosed.
Inventors
- 👤 Ignazio S. Megna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:49
CPC Classifications
C; C08; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A polymer blend consisting essentially of (A) about 90-97 percent by weight of a thermoplastic polyurethane elastomer, said elastomer comprising the product of reaction of about one molar proportion of a polymeric glycol selected from polyester glycols, polyether glycols and polythioether glycols, optionally from about 1 to 10 molar proportions of one or more low-molecular-weight aliphatic diols, and sufficient aromatic diisocyanate to react with essentially all of the hydroxyl groups of said polymeric glycol and said aliphatic diol, and (B) about 3-10 percent by weight of an ethylene/carboxylic acid copolymer prepared from ethylene and about 1.5 to about 30 weight percent of acrylic or methacrylic acid, the carboxyl groups of which are about 10% to 100% neutralized with an alkali metal, alkaline earth metal, or zinc ion.
Claim 2
Dependent Claim
127 words
A polymer blend consisting essentially of (A) about 90-97 percent by weight of a thermoplastic polyurethane elastomer, said elastomer comprising the product of reaction of about one molar proportion of a polymeric glycol selected from polyester glycols, polyether glycols and polythioether glycols, optionally from about 1 to 10 molar proportions of one or more low-molecular-weight aliphatic diols, and sufficient aromatic diisocyanate to react with essentially all of the hydroxyl groups of said polymeric glycol and said aliphatic diol, and (B) about 3-10 percent by weight of an ethylene/carboxylic acid copolymer prepared from ethylene and about 1.5 to about 30 weight percent of acrylic or methacrylic acid, the carboxyl groups of which are about 10% to 100% neutralized with an alkali metal, alkaline earth metal, or zinc ion.
Claim 3
Dependent Claim
16 words
A blend according to claim 1 wherein said polyurethane elastomer is prepared from a polythioether glycol.
Claim 4
Dependent Claim
16 words
A blend according to claim 1 wherein said polyurethane elastomer is prepared from a polyester glycol.
Claim 5
Dependent Claim
16 words
A blend according to claim 1 wherein said polyurethane elastomer is prepared from a polyether glycol.
Claim 6
Dependent Claim
12 words
A blend according to claim 1 wherein said aromatic diisocyanate is methylenebis(4-phenylisocyanate).
Claim 7
Dependent Claim
38 words
A blend according to claim 1 wherein said (B) comprises a copolymer of 85-95 percent ethylene and 5-15 percent of methacrylic or acrylic acid, the carboxyl groups of which are about 50%-100% neutralized with sodium or zinc ions.
Claim 8
Dependent Claim
16 words
A blend according to claim 6 wherein said polyurethane elastomer is prepared from a polythioether glycol.
Claim 9
Dependent Claim
16 words
A blend according to claim 6 wherein said polyurethane elastomer is prepared from a polyester glycol.
Claim 10
Dependent Claim
16 words
A blend according to claim 6 wherein said polyurethane elastomer is prepared from a polyether glycol.
References Cited (Backward Citations)
US3658635A
Cited
US3833708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |