UNSATURATED POLYESTER RESIN COMPOSITION, CAST-MOLDING MATERIAL AND RTM MOLDING METHOD

摘要

PROBLEM TO BE SOLVED: To obtain the subject composition capable of keeping high storage stability of a thixotropic agent even by compounding a filler, free from precipitation of filler and having good cast moldability by using a hydrophilic silica thixotropic agent and a hydrophobic silica thixotropic agent as essential components and adjusting the thixotropic index to a specific level. ;SOLUTION: The objective composition is composed of (A) an unsaturated polyester, (B) a polymerizable monomer (preferably styrene), (C) a thixotropic agent composed of hydrophilic fine silica powder (preferably fine silica powder having a specific surface area of 80-150m²/g and containing ≥1.8 silanol groups per 1nm²), (D) a thixotropic agent composed of hydrophobic fine silica powder (preferably fine silica powder having a specific surface area of 80-150m²/g and containing 1.8 silanol groups per 1nm²) and (E) a filler (preferably calcium carbonate, etc., having a particle diameter of 0.8-10μm). The TI(thixotropic index) of the composition composed of the components A to D is adjusted to ≤2. The sum of the components C and D is preferably ≤1.5 pts.wt. based on 100 pts.wt. of the sum of the components A and B. The weight ratio of C:D is preferably 20:80 to 80:20.;COPYRIGHT: (C)1997,JPO