Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1986-10-30
1988-12-06
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253302, 525369, C08F 848
Patent
active
047897090
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.
REFERENCES:
patent: 4246374 (1981-01-01), Kopchik
patent: 4248990 (1981-02-01), Pieski et al.
patent: 4252924 (1981-02-01), Chatterjee
Hashimoto Tsuyoshi
Iijima Susumu
Kato Yasuyuki
Matsuura Hideaki
Moritani Masahiko
Lipman Bernard
Schofer Joseph L.
Sumitomo Chemical Company Limited
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