METHOD OF MOLDING RIGID POLYURETHANE FOAMS
First Claim
1. A method of making a molded rigid polyurethane foam comprising:
- injecting into a closed mold cavity a reaction mixture at a packing factor of 1.03 to 1.9, wherein the mold cavity is under a pressure of from 300 to 950 mbar, wherein the reaction mixture comprises;
a) an organic polyisocyanate;
b) a polyol composition;
c) a catalyst;
d) optionally auxiliary substances and/or additives; and
e) a chemical blowing agent component in an amount of from 1 to 5 weight percent based on the total weight of components b) to e), the chemical blowing agent component comprising at least one chemical blowing agent,wherein the chemical blowing agent component is the sole blowing agent.
0 Assignments
0 Petitions
Accused Products
Abstract
A method of making a molded rigid polyurethane foam comprising injecting into a closed mold cavity a reaction mixture at a packing factor of 1.03 to 1.9, wherein the mold cavity is under a pressure of from 300 to 950 mbar, wherein the reaction mixture comprises an organic polyisocyanate, a polyol composition, a catalyst, optionally auxiliary substances and/or additives, and a chemical blowing agent component in an amount of from 1 to 5 weight percent based on the total weight of the components excluding polyisocyanate, the chemical blowing agent component comprising at least one chemical blowing agent, wherein the chemical blowing agent component is the sole blowing agent.
-
Citations
17 Claims
-
1. A method of making a molded rigid polyurethane foam comprising:
-
injecting into a closed mold cavity a reaction mixture at a packing factor of 1.03 to 1.9, wherein the mold cavity is under a pressure of from 300 to 950 mbar, wherein the reaction mixture comprises; a) an organic polyisocyanate; b) a polyol composition; c) a catalyst; d) optionally auxiliary substances and/or additives; and e) a chemical blowing agent component in an amount of from 1 to 5 weight percent based on the total weight of components b) to e), the chemical blowing agent component comprising at least one chemical blowing agent, wherein the chemical blowing agent component is the sole blowing agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 17)
-
-
13. A rigid polyurethane foam comprising the reaction product of:
-
a) an organic polyisocyanate; b) a polyol composition, wherein the polyol composition comprises; b1) a polyether polyol having a functionality of from 5 to 8 b2) a polyether polyol having a functionality of from 2 to 4; c) at least two of a curing catalyst, a blowing catalyst and a trimerization catalyst; d) at least one silicone surfactant; and e) water, in an amount of from 2.5 to 3.5 weight percent based on the total weight of components b) to e), wherein water is the sole blowing agent. - View Dependent Claims (14, 15, 16)
-
Specification