Patent US4616042A successfully refreshed from Google Patents.
US4616042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature impact modified thermoplastic foam
Assignee: General Electric Co
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Filing: 1985-06-14
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Granted: 1986-10-07
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Expires: 2005-06-14
Abstract
Abstract The low temperature impact strength of foam thermoplastic articles is increased with the addition of polysiloxane-polycarbonate block copolymer.
Inventors
- 👤 Roger W. Avakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:25
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08L; C08L67/00; C08L69/00; C08L69/005; C08J2483/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
42 words
A thermoplastic blend comprising: (i) at least one thermoplastic resin selected from the group consisting of polyester, polycarbonates and poly(ester-carbonates); (ii) an effective amount of polysiloxane-polycarbonate block copolymer to increase low temperature impact strength; and (iii) an effective amount of blowing agent.
Claim 2
Dependent Claim
42 words
A thermoplastic blend comprising: (i) at least one thermoplastic resin selected from the group consisting of polyester, polycarbonates and poly(ester-carbonates); (ii) an effective amount of polysiloxane-polycarbonate block copolymer to increase low temperature impact strength; and (iii) an effective amount of blowing agent.
Claim 3
Dependent Claim
17 words
The thermoplastic blend of claim 1 which additionally contains an effective amount of a suitable nucleating agent.
Claim 4
Dependent Claim
30 words
The thermoplastic blend of claim 1 in which said polysiloxane-polycarbonate block copolymer has a weight ratio to said at least one thermoplastic resin ranging from about 1/100 to about 1/3.
Claim 5
Dependent Claim
49 words
A foamed thermoplastic article comprising: (i) at least one thermoplastic resin selected from the group consisting of polyester, polycarbonates and poly(ester-carbonates); (ii) an effective amount of polysiloxane-polycarbonate block copolymer to increase low temperature impact strength; and (iii) the reaction or gaseous residue of an effective amount of blowing agent.
Claim 6
Dependent Claim
49 words
A foamed thermoplastic article comprising: (i) at least one thermoplastic resin selected from the group consisting of polyester, polycarbonates and poly(ester-carbonates); (ii) an effective amount of polysiloxane-polycarbonate block copolymer to increase low temperature impact strength; and (iii) the reaction or gaseous residue of an effective amount of blowing agent.
Claim 7
Dependent Claim
18 words
The foamed thermoplastic article of claim 4 which additionally comprises an effective amount of a suitable nucleating agent.
Claim 8
Dependent Claim
31 words
The foamed thermoplastic article of claim 4 in which said polysiloxane-polycarbonate block copolymer has a weight ratio to said at least one thermoplastic resin ranging from about 1/100 to about 1/3.
Claim 9
Independent Claim
72 words
A method for improving the low temperature impact strength of articles foam molded or foam extruded from a composition containing a blowing agent and comprising at least one thermoplastic resin selected from the group consisting of polyester polycarbonates and poly(ester-carbonates), which method comprises the step of melt blending an effective amount of polysiloxane-polycarbonate block copolymer with said composition to produce a thermoplastic blend prior to a foam molding or foam extrusion step.
Claim 10
Independent Claim
72 words
A method for improving the low temperature impact strength of articles foam molded or foam extruded from a composition containing a blowing agent and comprising at least one thermoplastic resin selected from the group consisting of polyester polycarbonates and poly(ester-carbonates), which method comprises the step of melt blending an effective amount of polysiloxane-polycarbonate block copolymer with said composition to produce a thermoplastic blend prior to a foam molding or foam extrusion step.
Claim 11
Dependent Claim
31 words
The method of claim 7 wherein said polysiloxane-polycarbonate block copolymer is melt blended with said at least one thermoplastic resin in a weight ratio ranging from about 1/100 to about 1/3.
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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) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |