Styrenic resin molding and process for producing same

Details Styrenic resin molding and process for producing same Styrenic resin molding and process for producing same

1992-08-03

1994-10-18

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526346, 528481, 528503, 428220, 264291, 264292, 26433117, 264345, C08F 1200, C08J 518

Patent

active

053570146

ABSTRACT:
There are disclosed a styrenic resin molding having a high crystallinity and excellent in heat resistance, solvent resistance and transparency, and a process for producing the same. Specifically the present invention provides an orientable or thermoformable non-oriented styrenic resin molding having a crystallinity of 25% or more, a spherulite radius of 10 .mu.m or less and a haze of 5% or less and comprising a styrenic polymer having a high degree of syndiotactic configuration; a process for producing the above non-oriented molding; a transparent styrenic-resin molding having a crystallinity of 30% or more which is obtained by thermoforming or orienting the above non-oriented molding at an expansion ratio by area of 1.2 or more; and the process for producing the same. The styrenic resin molding of the present invention can be effectively utilized as heat-resisting transparent sheet, medical treatment container, microwave-range container, food package container such as hot packing container, oven container, retort container, etc., and heat-resisting transparent container such as heat-resisting bottle.

REFERENCES:
patent: 4824629 (1989-04-01), Seitz et al.
patent: 4959435 (1990-09-01), Seitz et al.
Database WPIL, Week 8823, Derwent Publications Ltd., AN 88-158202, JP-A-63 098 431, Apr. 28, 1988, "Moulding Styrenic Polymer Providing High Heat-Resistance--Involves Heat-Treating Non-Crystalline Styrenic Polymer Moulding Having Syndiotactic Structure".
Database WPIL, Week 8949, Derwent Publications Ltd., AN 89-361739, JP-A-1 272 608, Oct. 31, 1989, "Syndiotactic Polystyrene Alpha-Crystalline Structure--Is Prepared by Melting Starting Polymer, Cooling and Heating Solidified Polymer to Crystallise".

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