Process of making thermoset foams of acrylic polymers
AssigneeThe Dow Chemical Company
InventorFrank L. Saunders
Life of this patent
Estimating the term…
Abstract
High density thermoset foams of acrylic polymers are prepared by dry mixing a hydroxy-functional acrylic polymer, e.g., a copolymer of styrene, ethyl acrylate, hydroxy alkyl acrylate and acrylic acid, with a crosslinking agent, e.g., a melamineformaldehyde condensate, and then subjecting the resulting mixture to conditions sufficient to cause the mixture to foam and to crosslink to a thermoset material.
Claims3
A process for producing a thermoset foam consisting essentially of the steps of (1) mixing a normally solid, hydroxy-functional acrylic polymer and an aminoplast resin crosslinking agent and (2) heating the resulting mixture to a heat plastified state until the polymer and crosslinking agent react to form at least one volatile by-product which foams the residual heat-plastified mixture which crosslinks to form the thermoset foam.
A process consisting essentially of (1) placing a normally solid hydroxy-functional acrylic polymer and an aminoplast resin cross-linking agent in a mold;
- and (2) heating said polymer and resin until they have formed a thermoset foamed article.
Dependencies are inferred from the claim text.