Blocked prepolymers and acrylic plastisol compositions comprising the blocked prepolymers
AssigneeDow Global Technologies LLC
InventorMasayuki Suzuki
Life of this patent
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Abstract
The invention generally relates to blocked prepolymers. More specifically, the invention generally relates to plastisol compositions comprising the blocked prepolymers. The blocked prepolymer is the reaction product of at least an isocyanate terminated prepolymer and a blocking agent, wherein the blocking agent is a nitrogen containing blocking agent. The isocyanate terminated prepolymer is the reaction product of at least one or more polyols comprising at least one polyol having an amine initiator and a stoichiometric excess of one or more organic polyisocyanate components.
Claims14
A blocked prepolymer which is the reaction product of at least:
- (a) an isocyanate terminated prepolymer which is the reaction product of at least:
- (1) one or more polyols comprising at least one polyol having a tertiary amine initiator, wherein the at least one polyol having a tertiary amine initiator comprises at least 1 percent by weight and up to 15 percent by weight of the blocked prepolymer;
- and
- (2) a stoichiometric excess of one or more organic polyisocyanate components;
- and
- (b) a blocking agent;
- wherein the stoichiometric excess of isocyanate to alcohol moieties (NCO:OH) is from 1.20:1 to 4:1.
A blocked prepolymer which is the reaction product of at least:
- (a) an isocyanate terminated prepolymer which is the reaction product of at least:
- (1) one or more polyols comprising at least one polyol having a tertiary amine initiator;
- and
- (2) a stoichiometric excess of one or more organic polyisocyanate components;
- and
- (b) a blocking agent;
- wherein:
- the stoichiometric excess of isocyanate to alcohol moieties (NCO:OH) is from about 1.1:1 to about 4:1, and
- the at least one polyol having is obtained by alkoxylation of the tertiary amine initiator having the formula:
- HmA-(CH2)n—N(R)—(CH2)p-AHm (I)
- wherein n and p are independently integers from 2 to 6;
- A at each occurrence is independently oxygen, nitrogen, or sulphur;
- R is a C1 to C3 alkyl group;
- and
- m is 1 when A is oxygen and m is 2 when A is nitrogen.
An acrylic plastisol composition which is the reaction product of:
- a blocked prepolymer which is the reaction product of:
- an isocyanate terminated prepolymer which is the reaction product of at least:
- the one or more polyols comprising at least one polyol having a secondary amine initiator or a tertiary amine initiator;
- and
- a stoichiometric excess of one or more organic polyisocyanate components;
- and
- a blocking agent
- one or more acrylic powders;
- one or more plasticizers;
- one or more amine cross-linkers;
- and
- optionally, one or more fillers.
Dependencies are inferred from the claim text.