Styrenic resin laminate and molding thereof
AssigneeIdemitsu Kosan Co., Ltd.
InventorShinichi Miura
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Abstract
There are disclosed a styrenic resin laminate comprising at least one surface layer consisting essentially of a styrenic polymer having a high degree of syndiotactic configuration (SPS layer) and a foam layer (other layer) consisting essentially of a styrenic resin (GPPS, IPS, HIPS, ABS resin, SMA copolymer, AS resin, modified PPO; blend of HIPS/PPO, etc); and a molding obtained by thermoforming the above-mentioned laminate. The above laminate is particularly excellent in heat resistance and easily thermoformable into the molding, which is also excellent in heat resistance and recyclability in terms of retention of flexural strength, utilizable in heating oil-base food with a microwave range and can easily be recovered for reuse, thereby greatly contributing to environmental preservation and resources saving.
Claims13
A styrenic resin laminate which comprises at least one surface layer consisting essentially of a styrenic polymer having a high degree of syndiotactic configuration having a proportion of racemic diad of at least 75% or a proportion of racemic pentad of at least 30%;
- a foam layer consisting essentially of a styrenic resin;
- and
- optionally a surface layer other than said styrenic polymer having a high degree of syndiotactic configuration layer,
- wherein said at least one surface layer consisting essentially of styrenic polymer having a high degree of syndiotactic configuration has a weight average molecular weight of 50,000 to 2,000,000;
- and
- a ratio of the total thickness of said foam layer and said surface layer other than said styrenic polymer having a high degree of syndiotactic configuration layer, if present, to the thickness of said at least one surface layer consisting essentially of said styrenic polymer having a high degree of syndiotactic configuration is in the range of 4 to 25,000:1.
A molding formed by thermoforming a styrenic resin laminate which comprises at least one surface layer consisting essentially of a styrenic polymer having a high degree of syndiotactic configuration having a proportion of racemic diad of at least 75% or a proportion of racemic pentad of at least 30%;
- a foam layer consisting essentially of a styrenic resin;
- and
- optionally a surface layer other than said styrenic polymer having a high degree of syndiotactic configuration layer,
- wherein said at least one surface layer consisting essentially of styrenic polymer having a high degree of syndiotactic configuration has a weight average molecular weight of 50,000 to 2,000,000;
- and
- a ratio of the total thickness of said foam layer and said surface layer other than said styrenic polymer having a high degree of syndiotactic configuration layer, if present, to the thickness of said at least one surface layer consisting essentially of said styrenic polymer having a high degree of syndiotactic configuration is in the range of 4 to 25,000:1.
Dependencies are inferred from the claim text.