Dual cure casting resin
AssigneeDAP Products Inc.
InventorGary L. Linden
Life of this patent
Estimating the term…
Abstract
The use of a monomer as the solvent in both components of a urethane polymerization system eliminates the need for the expenditure of much energy to remove solvent from the cured resin. The exotherm of the urethane cure supplies the heat for the activation of a relatively thermally stable free radical catalyst which then catalyzes the curing of the monomer. The two component system is stable in storage.
Claims9
In an exothermic condensation reaction polymerization system for forming a solid polyurethane resin and a second solid resin within said polyurethane resin, the combination comprising:
- a polyisocyanate reactant and a polyol reactant for entering into said exothermic condensation reaction to form said polyurethane;
- a solvent for said polyurethane reaction, said solvent comprising a liquid organic monomer capable of undergoing free radical polymerization to form said second resin;
- an organic hydroperoxide compound adapted to form a free radical polymerization initiator in said system to initiate polymerization of said organic monomer to eliminate need for removing said solvent from said system.
In a method of conducting a heat generating condensation reaction to form a solid polyurethane resin and a second solid resin within said polyurethane resin, the method comprising:
- (a) providing a reaction medium comprising a polyisocyanate reactant and a polyol reactant for entering into said heat generating condensation reaction to form said polyurethane resin;
- (b) providing a solvent for said reaction medium wherein said solvent comprises a liquid organic monomer capable of undergoing free radical polymerization to form said second resin;
- (c) providing an organic hydroperoxide in said reaction medium;
- (d) forming a free radical polymerization initiator from said organic hydroperoxide in said reaction medium by heat generated in said reaction medium;
- and
- (e) polymerizing said organic monomer to form said second resin by catalytic action of said free radical polymerization initiator thereby eliminating need for removal of said solvent from said reaction medium.
Dependencies are inferred from the claim text.