Process for producing aggregated latex particle

Abstract

An object of the present invention is to propose a novel thermoplastic resin composition having high impact resistance without degrading weather resistance even when the content of an impact modifier is small. A thermoplastic resin composition includes 100 parts by weight of a thermoplastic resin (a) and 0.5 to 20 parts by weight of an impact modifier (b) containing a graft copolymer (b-1) containing at least one (meth)acrylate flexible polymer phase and a rigid polymer phase serving as the outermost part of the graft copolymer, a water-soluble polymer compound (b-2) having a physical gel-forming property, and a gelling agent (b-3). In the thermoplastic resin composition, the content of the water-soluble polymer compound (b-2) having the physical gel-forming property is 0.01 to 3.0 parts by weight relative to 100 parts by weight of the graft copolymer (b-1) and the content of the rigid polymer phase serving as the outermost part in the graft copolymer (b-1) is 0.5 to 10 percent by weight.

Description

technical field [0001] The present invention relates to a thermoplastic resin composition excellent in weather resistance and impact resistance. Background technique [0002] In order to improve the impact resistance of thermoplastic resins, the addition of graft copolymers obtained by emulsion polymerization or suspension polymerization is widely used at present. For example, in the case of vinyl chloride-based resins, a diene-based or acrylate-based graft copolymer is known (for example, see Patent Document 1). [0003] However, when a diene-based graft copolymer is used in combination with a thermoplastic resin, the impact resistance can be improved, but since the weather resistance is poor, there is a disadvantage that the impact resistance of the manufactured molded product is significantly reduced when it is used outdoors. Therefore, as an impact resistance modifier for outdoor use, in order to improve the weather resistance of the diene system and impart impact resis...

AI Technical Summary

Problems solved by technology

However, in this method, although the weight ratio of the soft polymer phase can be increased, the composition of the soft polymer phase is limited, a significant impact resistance improvement effect cannot be expected, and the particle size of the impact resistance modifier is limited. , cannot avoid problems such as quality degradation other than impact resistance

For example, the particle size of the graft polymer is large, which is known to cause a decrease in physical properties represented by the surface gloss of the molded article

Moreover, when the particle size of the impact resistance modifier in the thermoplastic resin is large, although there is an effect of increasing the degree of stress concentration, at the same time, the distance between the particles becomes longer, which will cause a decrease in the degree of stress concentration. When the number of compounding parts of the agent is small, the influence of the distance between the particles becomes larger, and there is a problem that a sufficient impact resistance improvement effect cannot be obtained.