Patent US4883985A successfully refreshed from Google Patents.
US4789709A
Expired / Lapsed
US
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Process for the production of heat resistant thermoplastic copolymer
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1986-10-30
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Granted: 1988-12-06
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Expires: 2006-10-30
Abstract
Abstract A process for the production of a thermoplastic copolymer having excellent heat distortion resistance is disclosed. The process includes heat-treating a raw copolymer comprising a vinyl monomer unit including methacrylic and/or acrylic acid units in the presence of a specific ring-closing promoter selected from basic compounds, whereby the methacrylic and/or acrylic acid unit is converted into six-membered cyclic anhydride unit. The copolymer has excellent heat distortion resistance, transparency, mechanical properties and processability, and can produce a formed product without splash on the surface. The copolymer is useful for the production of various parts, such as automobile parts, electrical parts, industrial parts, and miscellaneous goods.
Inventors
- 👤 Yasuyuki Kato
- 👤 Masahiro Yuyama
- 👤 Masahiko Moritani
- 👤 Hideaki Matsuura
- 👤 Susumu Iijima
- 👤 Tsuyoshi Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:49
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/48
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A process for the production of a copolymer, which comprises heat-treating a raw copolymer comprising units of a vinyl monomer and 5 to 50% by weight of a methacrylic and/or acrylic acid unit in the presence of 0.01 to 0.5% by weight of a basic compound, thereby converting the methacrylic and/or acrylic acid unit into a six-membered cyclic anhydride unit, wherein the vinyl monomer is a member selected from the group consisting of methacrylic esters, acrylic esters and aromatic vinyl compounds, and the basic compound is a member selected from the group consisting of alkali metal hydroxides or carbonates, alkaline earth metal hydroxides, organic carboxylic acid alkali metal salts and alkali metal alkoxides.
Claim 2
Dependent Claim
113 words
A process for the production of a copolymer, which comprises heat-treating a raw copolymer comprising units of a vinyl monomer and 5 to 50% by weight of a methacrylic and/or acrylic acid unit in the presence of 0.01 to 0.5% by weight of a basic compound, thereby converting the methacrylic and/or acrylic acid unit into a six-membered cyclic anhydride unit, wherein the vinyl monomer is a member selected from the group consisting of methacrylic esters, acrylic esters and aromatic vinyl compounds, and the basic compound is a member selected from the group consisting of alkali metal hydroxides or carbonates, alkaline earth metal hydroxides, organic carboxylic acid alkali metal salts and alkali metal alkoxides.
Claim 3
Dependent Claim
21 words
The process according to claim 1, wherein the heat treatment is carried out at a temperature of 150° to 350° C.
Claim 4
Dependent Claim
23 words
The process according to claim 1, wherein the weight content of the methacrylic and/or acrylic acid unit is 5 to 40% by weight.
Claim 5
Dependent Claim
36 words
The process according to claim 1, wherein the basic compound is a member selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, calcium hydroxide, and magnesium hydroxide.
Claim 6
Dependent Claim
44 words
The process according to claim 1, wherein the basic compound is a member selected from the group consisting of lithium acetate, sodium acetate, potassium acetate, calcium acetate, magnesium acetate, lithium stearate, sodium stearate, potassium stearate, sodium methoxide, potassium methoxide, sodium ethoxide, and potassium ethoxide.
Claim 7
Dependent Claim
21 words
The process according to claim 2, wherein the heat treatment is carried out at a temperature of 220° to 320° C.
Claim 8
Dependent Claim
18 words
The process according to claim 1, which occurs by suspension polymerization, bulk polymerization, emulsion polymerization, or solution polymerization.
Claim 9
Dependent Claim
21 words
The process according to claim 1, wherein the aromatic vinyl compounds are selected from the group consisting of styrene and α-methylstyrene.
Claim 10
Dependent Claim
44 words
The process according to claim 1, wherein the methacrylic and acrylic esters are selected from the group consisting of methyl methacrylate, n-butyl methacrylate, t-butyl methacrylate, n-bornyl methacrylate, isobornyl methacrylate, fenchyl methacrylate, cyclohexyl methacrylate, phenyl methacrylate, benzyl methacrylate, dicyclopentanyl methacrylate, methyl acrylate, and butyl acrylate.
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JPS6058408A
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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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |