Non-birefringent resin material and film
AssigneeKaneka Corporation
InventorsFuminobu Kitayama, Nobuyoshi Maizuru, Keisuke Hatano
Life of this patent
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Abstract
Disclosed herein is a non-birefringent resin material that is very small in both orientation birefringence and photoelastic birefringence, has high transparency, and is capable of providing a molded article having few foreign matter defects and a film made of such a material. The non-birefringent resin material contains a resin (A) and a polymer (B) and has an orientation birefringence of −1.7×10−4 to 1.7×10−4 and a photoelastic constant of −4×10−12 to 4×10−12 Pa−1.
Claims38
A non-birefringent resin material comprising a resin (A) and a polymer (B) and having an orientation birefringence of −1.7×10−4 to 1.7×10−4 and a photoelastic constant of −4×10−12 to 4×10−12 Pa−1.
A non-birefringent resin material comprising a resin (A) and a polymer (B), wherein a photoelastic constant of the resin (A) and a photoelastic constant of the polymer (B) are opposite in sign, and the photoelastic constant of the resin (A) is cancelled out by the photoelastic constant of the polymer (B).
An acrylic resin composition comprising an acrylic resin (A) and a polymer (B) having a (meth)acrylic cross-linked polymer layer and a hard polymer layer having, as a structural unit, a monomer represented by the following formula (4):
- wherein R9 is a hydrogen atom or a substituted or unsubstituted linear or branched alkyl group having 1 to 12 carbon atoms, R10 is a substituted or unsubstituted aromatic group having 1 to 24 carbon atoms or a substituted or unsubstituted alicyclic group having 1 to 24 carbon atoms and has a homocyclic structure or a heterocyclic structure, l is an integer of 1 to 4, m is an integer of 0 or 1, and n is an integer of 0 to 10.
An acrylic resin composition comprising an acrylic resin (A) and a polymer (B) that is a (meth)acrylic rubber-containing graft copolymer obtained by multistage polymerization and that is formed by polymerization of a mixture containing a monomer represented by the following formula (4) and another monomer copolymerizable therewith in the presence of (meth)acrylic rubber-containing polymer particles in at least one stage of the multistage polymerization:
- wherein R9 is a hydrogen atom or a substituted or unsubstituted linear or branched alkyl group having 1 to 12 carbon atoms, R10 is a substituted or unsubstituted aromatic group having 1 to 24 carbon atoms or a substituted or unsubstituted alicyclic group having 1 to 24 carbon atoms and has a homocyclic structure or a heterocyclic structure, l is an integer of 1 to 4, m is an integer of 0 or 1, and n is an integer of 0 to 10.
A resin film having an orientation birefringence of −1.7×10−4 to 1.7×10−4, a photoelastic constant of −4×10−12 to 4×10−12 Pa−1, a tensile elongation at breakage of 10% or more, and a thickness of 10 μm or more but 500 μm or less.
Dependencies are inferred from the claim text.