Maleimide-based copolymer and process for producing it

Details Maleimide-based copolymer and process for producing it Maleimide-based copolymer and process for producing it

1995-06-06

1996-10-15

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526347, 5262921, 526273, 526318, 5263182, 5263171, 5263285, 526330, 526332, 526342, C08F22240, C08F21206, C08F21802, C08F22006

Patent

active

055655378

ABSTRACT:
This invention provides a maleimide-based copolymer in which, because its molecular weight-retention ratio at high temperature is high, deterioration of physical properties by heating is little. Also, this invention provides a process wherein a maleimide-based copolymer is arranged so as not to heat more than necessity and thereby a maleimide-based copolymer containing only a small amount of residual volatile components is efficiently obtained without deterioration of physical properties. The maleimide-based copolymer is such as having a glass transition temperature of 170.degree. C. or higher, a weight-average molecular weight of 100,000 to 500,000, and a molecular weight-retention ratio of 90% or more when heated at 280.degree. C. for 10 minutes. When this copolymer is produced, volatile components are separated by supplying a polymer composition containing said copolymer and volatile components to a vent type screw extruder and operating this extruder under condition of a screw rotation number of 50 to 150 rpm.

REFERENCES:
patent: 4816523 (1989-03-01), Tsujimoto et al.
patent: 5118270 (1992-06-01), Keiler et al.
patent: 5208307 (1993-05-01), Doi et al.
Database WPIL Week 8820, Derwent Publications Ltd., London, GB; AN 88-136374 & JP-A-63 077 904 (Denki Kagaku Kogyo KK) Apr. 8, 1988 Abstract.
Industrial & Production Engineering vol. 11, No. 3, pp. 128-132, 1987.
Effect Of Cross-Link Density Of Modification Of Epoxy Resin By N-Phenylmaleimide-Styrene Copolymers-Eur. Polym. J. vol. 29, No. 8, pp. 1103-1113, 1993.
Toughening Of Epoxy Resins By N-Phenylmaleimide-Styrene Copolymers-Eur. Polym. J. vol. 28, No. 12, pp. 1539-1545, 1992.
Chemical Abstracts vol. 118, p. 71, 82440k (1993).
Chemical Abstracts vol. 119, p. 53, 181950d (1993).

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