Low-color foam compositions
View Patent ↗Plastisols are provided which are effective for providing a foamed composition having an improved color. The plastisol includes a dispersed phase and a liquid phase. The dispersed phase includes an organic polymer and the liquid phase includes a plasticizer for said polymer. The plasticizer utilized has a hydroxyl number of about 30 or greater, and an acidity of not less than about 0.1% as benzoic acid.
1. A foam prepared from a plastisol by a process comprising:
forming a plastisol blowing agent precursor blend, the plastisol including a dispersed phase comprising particles of an organic polymer, wherein the organic polymer is selected from the group consisting of homopolymers and copolymers of vinyl chloride, and a liquid phase comprising a plasticizer for said polymer, the plasticizer having a hydroxyl number of 30 or greater, and an acidity of not more than about 0.1% as benzoic acid; and
heating the plastisol blowing agent precursor blend to a temperature effective for gelling the plastisol and fusing and blowing the plastisol to form the foam;
wherein the plasticizer is at least one member selected from the group consisting of diesters and monoesters of benzoic acid and diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, M P Diol , neopentyl glycol and 1,3-butanediol and the combination thereof, and wherein the plasticizer is effective for providing the foam with a color of less than 28YI.
2. The foam of claim 1 wherein the plasticizer has a hydroxyl number of about 30 to about 100.
3. The foam of claim 1 wherein the plastisol further comprises at least one ingredient selected from the group consisting of fillers, pigments, heat stabilizers, lubricants, flame retardants, esters of phosphoric acid, foaming agents, foaming catalysts, surfactants and UV absorbers.
4. The foam of claim 1 wherein the fusible organic polymer is a blend of a dispersion grade and a blending grade of polyvinyl chloride and the plasticizer is a blend of the mono- and dibenzoates of diethylene glycol and dipropylene glycol.