US4737523A
Expired / Lapsed
US
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Foamable molding compositions
Assignee: Bayer Corp
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Filing: 1987-06-19
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Granted: 1988-04-12
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Expires: 2007-06-19
Abstract
Abstract Foamable, thermoplastic molding composition exhibiting an improved level of impact resistance is provided. The composition, which is suitable for the preparation of expanded molded parts, comprise a thermoplastic resin, preferably at least one selected from a group consisting of polycarbonate, polyalkylene terephthalate, aromatic polyester and polyester carbonate, a nucleating agent, a chemical blowing agent and an anhydride. It was unexpectedly found that the composition is suitable for the molding of articles having an improved level of impact resistance.
Inventors
- 👤 Roger J. White
- 👤 Sivaram Krishnan
- 👤 Wolfgang J. Siebourg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:27
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/04; C08J9/06; C08J9/10; C08J9/104; C08J2367/00; C08J2367/02; C08J2369/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
96 words
A foamable thermoplastic molding composition comprising (i) a foamable thermoplastic resin selected from the group consisting of polycarbonate, polyalkylene terephthalate, aromatic polyester, polyester carbonate, (ii) about 0.01 to 10 percent of a polymeric compound containing at least one cyclic anhydride in its structure, (iii) 0.1 to 15 percent of a chemical blowing agent the decomposition product of which comprises a primary amine, and (iv) an amount of a nucleating agent for structural foam sufficient to produce a substantially uniform cell size in the resulting foam, said percents being in relation to the weight of said (i).
Claim 2
Dependent Claim
96 words
A foamable thermoplastic molding composition comprising (i) a foamable thermoplastic resin selected from the group consisting of polycarbonate, polyalkylene terephthalate, aromatic polyester, polyester carbonate, (ii) about 0.01 to 10 percent of a polymeric compound containing at least one cyclic anhydride in its structure, (iii) 0.1 to 15 percent of a chemical blowing agent the decomposition product of which comprises a primary amine, and (iv) an amount of a nucleating agent for structural foam sufficient to produce a substantially uniform cell size in the resulting foam, said percents being in relation to the weight of said (i).
Claim 3
Dependent Claim
23 words
The molding composition of claim 1 wherein said (i) is selected from the group consisting of polycarbonate, polyalkylene terephthalate, aromatic polyester and polyester-carbonate.
Claim 4
Dependent Claim
20 words
The molding composition of claim 1 wherein said polymeric compound is present at an amount 0.1 to about 5 percent.
Claim 5
Dependent Claim
20 words
The molding composition of claim 1 wherein said polymeric compound contains at least one maleic acid anhydride in its structure.
Claim 6
Dependent Claim
59 words
The molding composition of claim 4 wherein said anhydride conforms to ##STR6## where R is a substituted or an unsubstituted radical selected from the group consisting of C 6 -C 12 phenyl, C 1 -C 12 alkoxy and C 1 -C 28 alkyl radicals, n is an integer of from 1 to 200 and m is 1 to 5.
Claim 7
Dependent Claim
61 words
The molding composition of claim 1 wherein said (iii) conforms to ##STR7## wherein R and R 1 independently denote a member selected from the group consisting of primary, secondary and tertiary straight-chain or branched-chain C 1 -C 8 alkyl, C 5 -C 8 cycloalkyl, C 6 -C 10 aryl, C 7 -C 10 aralkyl and C 7 -C 10 alkaryl radicals.
Claim 8
Dependent Claim
43 words
The molding composition of claim 6 wherein at least one of R and R 1 is selected from the group consisting of isopropyl, secondary butyl and tertiary butyl radicals and the other of R and R 1 is C 1 -C 4 alkyl.
Claim 9
Dependent Claim
25 words
The molding composition of claim 6 wherein R 1 and R independently are selected from the group consisting of isopropyl, secondary butyl and tertiary butyl.
Claim 10
Dependent Claim
11 words
The molding composition of claim 6 wherein said (iii) is diisopropylhydrazodicarboxylate.
Claim 11
Dependent Claim
74 words
A foamable thermoplastic molding composition comprising (i) a thermoplastic polycarbonate resin, (ii) about 0.01 to 10 percent of a 1:1 copolymer of α-octadecene and maleic anhydride having a molecular weight of about 50,000, and (iii) 0.1 to 15 percent of diisopropyl hydrazodicarboxylate, and (iv) 0.05 to 5 percent of a nucleating agent selected from the group consisting of milled glass, glass fibers and talc, said percents being relative to the weight of said (i).
Claim 12
Dependent Claim
74 words
A foamable thermoplastic molding composition comprising (i) a thermoplastic polycarbonate resin, (ii) about 0.01 to 10 percent of a 1:1 copolymer of α-octadecene and maleic anhydride having a molecular weight of about 50,000, and (iii) 0.1 to 15 percent of diisopropyl hydrazodicarboxylate, and (iv) 0.05 to 5 percent of a nucleating agent selected from the group consisting of milled glass, glass fibers and talc, said percents being relative to the weight of said (i).
Claim 13
Dependent Claim
11 words
The molding composition of claim 1 further comprising glass fiber reinforcements.
Claim 14
Dependent Claim
10 words
The molding composition of claim 1 further comprising mineral fillers.
Claim 15
Dependent Claim
14 words
The molding composition of claim 1 further comprising glass fiber reinforcements and flame-retarding agents.
Claim 16
Dependent Claim
95 words
A foamable thermoplastic molding composition comprising (i) a foamable thermoplastic resin selected from the group consisting of polyalkylene terephthalate, aromatic polyester and polyester carbonate, (ii) about 0.01 to 10 percent of a polymeric compound containing at least one cyclic anhydride in its structure, (iii) 0.1 to 15 percent of a chemical blowing agent the decomposition product of which comprises a primary amine, and (iv) an amount of a nucleating agent for structural foam sufficient to produce a substantially uniform cell size in resulting foam, said percents being in relation to the weight of said (i).
Claim 17
Dependent Claim
95 words
A foamable thermoplastic molding composition comprising (i) a foamable thermoplastic resin selected from the group consisting of polyalkylene terephthalate, aromatic polyester and polyester carbonate, (ii) about 0.01 to 10 percent of a polymeric compound containing at least one cyclic anhydride in its structure, (iii) 0.1 to 15 percent of a chemical blowing agent the decomposition product of which comprises a primary amine, and (iv) an amount of a nucleating agent for structural foam sufficient to produce a substantially uniform cell size in resulting foam, said percents being in relation to the weight of said (i).
Claim 18
Dependent Claim
98 words
A foamable thermoplastic molding composition comprising (i) a foamable thermoplastic resin selected from the group consisting of polycarbonate, polyalkylene terephthalate, aromatic polyester, polyester carbonate, (ii) about 0.1 to 10 percent of a copolymer of α-olefin and maleic anhydride having a molecular weight of about 50,000, (iii) 0.1 to 15 percent of a chemical blowing agent the decomposition product of which comprises a primary amine, and (iv) an amount of a nucleating agent for structural foam sufficient to produce a substantially uniform cell size in the resulting foam, said percents being in relation to the weight of said (i).
Claim 19
Dependent Claim
98 words
A foamable thermoplastic molding composition comprising (i) a foamable thermoplastic resin selected from the group consisting of polycarbonate, polyalkylene terephthalate, aromatic polyester, polyester carbonate, (ii) about 0.1 to 10 percent of a copolymer of α-olefin and maleic anhydride having a molecular weight of about 50,000, (iii) 0.1 to 15 percent of a chemical blowing agent the decomposition product of which comprises a primary amine, and (iv) an amount of a nucleating agent for structural foam sufficient to produce a substantially uniform cell size in the resulting foam, said percents being in relation to the weight of said (i).
References Cited (Backward Citations)
US3586658A
Cited
US3888801A
Cited
US4207402A
Cited
US4378449A
Cited
US4312958A
Cited
US4323655A
Cited
US4420584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |