US3923922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy-crosslinked, foamed nitrile containing polymers and method of preparing same
Assignee: GE Chemicals Inc
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Filing: 1974-08-19
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Granted: 1975-12-02
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Expires: 1994-08-19
Abstract
Abstract Nitrile - containing thermoplastic compositions, when lightly crosslinked by compounding with from 0.1 to about 1.0% by weight of an epoxy compound and with 0.1 to about 1.0% of a suitable curing agent, and cured by compounding at temperatures in excess of 350* F, are capable of being thermally processed by injection molding and extrusion processes and exhibit improved hot-strength characteristics compared with the uncrosslinked thermoplastic. The crosslinked compositions retain sufficient thermoplastic character to permit foaming, and when additionally compounded with a blowing agent, may be extruded or injection-molded to give structures exhibiting a smooth skin and a uniform cellular structure, which have hot strength properties adequate for postforming operations.
Inventors
- 👤 Thomas S Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:38
CPC Classifications
C; C08; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/12; C08F; C08F8/00; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/10; C08L101/00; C08L101/02; C08L55/00; C08L55/02; C08L63/00; Y; Y10; Y10S; Y10S264/00; Y10S264/14; Y10S264/83
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
A method of making a crosslinked, thermally processable composition comprising the steps of (1) melt mixing a blend comprising a thermoplastic copolymer selected from the group styrene-acrylonitrile copolymers, graft copolymers of styrene and acrylonitrile on rubbery polydiene substrates, and mixtures thereof, an epoxy resin in the amount of from 0.1 to about 1.0% by weight of said composition, and an acidic curing agent for epoxy resin in the amount of from about 0.1% to about 1.0% by weight of the said composition at a temperature greater than about 350*F., to thereby cure and crosslink said blend, and (2) cooling and pelletizing said blend.
Claim 2
Independent Claim
103 words
A method of making a crosslinked, thermally processable composition comprising the steps of (1) melt mixing a blend comprising a thermoplastic copolymer selected from the group styrene-acrylonitrile copolymers, graft copolymers of styrene and acrylonitrile on rubbery polydiene substrates, and mixtures thereof, an epoxy resin in the amount of from 0.1 to about 1.0% by weight of said composition, and an acidic curing agent for epoxy resin in the amount of from about 0.1% to about 1.0% by weight of the said composition at a temperature greater than about 350*F., to thereby cure and crosslink said blend, and (2) cooling and pelletizing said blend.
Claim 3
Dependent Claim
47 words
The method of claim 1 further comprising the step of mixing said pelletized blend with a foaming agent in the amount of from about 0.1% to about 5% by weight of the total composition, thereby rendering the crosslinked composition capable of being foamed during further thermal processing.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the thermoplastic copolymer is an ABS graft copolymer.
Claim 5
Independent Claim
131 words
A METHOD OF MAKING A CROSSLINKED, THERMALLY PROCESSABLE AND FOAMABLE THERMOPLASTIC COMPOSITION COMPRISING THE STEPS OF (1) MELT MIXING A BLEND COMPRISING A THERMOPLASTIC COPOLYMER SELECTED FROM THE GROUP STYRENE-ACRYLONITRILE COPOLTMERS, GRAFT COPOLYMERS OF STYRENE AND ACRYLONITRILE ON RUBBERYY DIENE SUBSTRATES AND MIXTURES THEREOF, AN EPOXY RESIN IN THE AMOUNT OF FROM 0.1 TO ABOUT 1.0% BY WEIGHT OF THE SAID COMPOSITION AND AN ACIDIC CURING AGENT FOR THE EPOXY RESIN IN THE AMOUNT OF FROM ABOUT 0.1 TO ABOUT 1.0% BY WEIGHT OF THE SAID COMPOSITION AT A TEMPERATURE GREATER THAN 350*F. TO THEREBY CURE AND CROSSLINK SAID BLEND (2) COOLING SAID PELLETIZING SAID CURE LINKED BLEND, AND (3) MIXING SAID PELLETIZED BLEND WITH A FOAMING AGENT IN THE AMOUNT OF FROM 0.1 TO 5% BY WEIGHT OF SAID COMPOSITION.
Claim 6
Independent Claim
131 words
A METHOD OF MAKING A CROSSLINKED, THERMALLY PROCESSABLE AND FOAMABLE THERMOPLASTIC COMPOSITION COMPRISING THE STEPS OF (1) MELT MIXING A BLEND COMPRISING A THERMOPLASTIC COPOLYMER SELECTED FROM THE GROUP STYRENE-ACRYLONITRILE COPOLTMERS, GRAFT COPOLYMERS OF STYRENE AND ACRYLONITRILE ON RUBBERYY DIENE SUBSTRATES AND MIXTURES THEREOF, AN EPOXY RESIN IN THE AMOUNT OF FROM 0.1 TO ABOUT 1.0% BY WEIGHT OF THE SAID COMPOSITION AND AN ACIDIC CURING AGENT FOR THE EPOXY RESIN IN THE AMOUNT OF FROM ABOUT 0.1 TO ABOUT 1.0% BY WEIGHT OF THE SAID COMPOSITION AT A TEMPERATURE GREATER THAN 350*F. TO THEREBY CURE AND CROSSLINK SAID BLEND (2) COOLING SAID PELLETIZING SAID CURE LINKED BLEND, AND (3) MIXING SAID PELLETIZED BLEND WITH A FOAMING AGENT IN THE AMOUNT OF FROM 0.1 TO 5% BY WEIGHT OF SAID COMPOSITION.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein the thermoplastic copolymer is an ABS graft copolymer.
Claim 8
Dependent Claim
97 words
A crosslinked thermoplastic composition capable of being thermally-processed comprising a blend of (1) a thermoplastic copolymer selected from the group styreneacrylonitrile copolymers, graft copolymers of styrene and acrylonitrile on rubbery polydiene substrates, and mixtures thereof, (2) an epoxy resin in the amount of from about 0.1% to about 1.0% by weight of the said compositiOn and (3) an acidic curing agent for the epoxy resin in the amount of about 0.1% to about 1.0% by weight of the said composition, said blend being melt mixed at a temperature above 350*F. to thereby obtain a cured, crosslinked material.
Claim 9
Dependent Claim
97 words
A crosslinked thermoplastic composition capable of being thermally-processed comprising a blend of (1) a thermoplastic copolymer selected from the group styreneacrylonitrile copolymers, graft copolymers of styrene and acrylonitrile on rubbery polydiene substrates, and mixtures thereof, (2) an epoxy resin in the amount of from about 0.1% to about 1.0% by weight of the said compositiOn and (3) an acidic curing agent for the epoxy resin in the amount of about 0.1% to about 1.0% by weight of the said composition, said blend being melt mixed at a temperature above 350*F. to thereby obtain a cured, crosslinked material.
Claim 10
Dependent Claim
14 words
The composition of claim 6 wherein the thermoplastic copolymer is an ABS graft copolymer.
Claim 11
Dependent Claim
141 words
A crosslinked thermoplastic composition capable of being thermally-processed and foamed comprising a blend of (1) a thermoplastic copolymer selected from the group styrene-acrylonitrile copolymers, graft copolymers of styrene and acrylonitrile on rubbery diene substrates and mixtures thereof, (2) an epoxy resin in the amount from about 0.1% to about 1.0% by weight of the said composition and (3) an acidic curing agent for the epoxy resin in the amount of about 0.1% to about 1.0% by weight of the said composition, said blend being melt mixed at a temperature above 350*F. to thereby obtain a cured, crosslinked material and said crosslinked material then further mixed with from 0.1 to 5% by weight of a foaming agent, thereby obtaining a thermoplastic crosslinked composition capable of being foamed by further thermal processing at a temperature above the decomposition temperature of the foaming agent.
Claim 12
Dependent Claim
141 words
A crosslinked thermoplastic composition capable of being thermally-processed and foamed comprising a blend of (1) a thermoplastic copolymer selected from the group styrene-acrylonitrile copolymers, graft copolymers of styrene and acrylonitrile on rubbery diene substrates and mixtures thereof, (2) an epoxy resin in the amount from about 0.1% to about 1.0% by weight of the said composition and (3) an acidic curing agent for the epoxy resin in the amount of about 0.1% to about 1.0% by weight of the said composition, said blend being melt mixed at a temperature above 350*F. to thereby obtain a cured, crosslinked material and said crosslinked material then further mixed with from 0.1 to 5% by weight of a foaming agent, thereby obtaining a thermoplastic crosslinked composition capable of being foamed by further thermal processing at a temperature above the decomposition temperature of the foaming agent.
Claim 13
Dependent Claim
22 words
The composition of claim 7 wherein said blend further comprises a thermoplastic resin selected from the group polyvinylchloride, polycarbonate, and chlorinated polyethylene.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |