Plasticizer compositions for non-aqueous plastisols
View Patent ↗Monoesters derived from a dihydric alcohol and a carboxylic acid such as benzoic acid are secondary plasticizers for non-aqueous and solventless plastisols containing primary plasticizers that do not contain unreacted alkanol groups.
1. A non-aqueous plastisol composition comprising:
A. at least one organic polymer; and
B. at least one primary plasticizer; and
at least one secondary plasticizer selected from the group consisting of monoesters derived from a dihydric alcohol and an aromatic monocarboxylic acid,
wherein said primary plasticizer is selected from the group consisting of diethylene glycol dibenzoate, triethylene glycol dibenzoate and dipropylene glycol dibenzoate and at least a portion of said secondary plasticizer is the corresponding monoester and the total of all monoesters constitutes from 5 to 20 of the total weight of said primary and secondary plasticizers.
wherein the concentration of said secondary plasticizer is sufficient to reduce the viscosity exhibited by said plastisol in the presence of said primary plasticizer alone while remaining compatible with said plastisol.
2. A composition according to claim 1 wherein said monoester is a liquid at 25° C.
3. A composition according to claim 2 wherein said secondary plasticizer constitutes from 1 to 25 percent of the combined weights of primary and secondary plasticizers and said dihydric alcohol contains from 2 to 10 carbon atoms.
4. A composition according to claim 3 wherein said organic polymer is polyvinyl chloride.
5. A plastisol composition of claim 1 wherein the concentration of said plasticizer composition is from 10 to 100 parts by weight per 100 parts by weight of said organic polymer.
6. In an improved method for preparing a plastisol wherein said method comprises blending organic polymer with a primary plasticizer and a secondary plasticizer, the improvement comprising selecting the primary plasticizer from the group consisting diethylene glycol dibenzoate, triethylene glycol dibenzoate and dipropylene glycol dibenzoate, and selecting said secondary plasticizer from the group consisting of monoesters derived from a dihydric alcohol and an aromatic monocarboxylic acid, wherein at least a portion of said secondary plasticizer is the corresponding monoester and the total of all monoesters constitutes from 5 to 20 of the total weight of said primary and secondary plasticizers, wherein the concentration of said secondary plasticizer is sufficient to reduce the viscosity exhibited by said plastisol in the presence of said primary plasticizer alone while remaining compatible with said plastisol.
7. A method according to claim 6 wherein said polymer is polyvinyl chloride.
8. A method according to claim 6 wherein the concentration of said plasticizer composition is from 10 to 100 parts by weight per 100 parts by weight of said organic polymer.