US 2014/0213741 A1Published application

Low Free MDI Prepolymers for Rotational Casting

AssigneeChemtura Corporation

InventorsGerald King, Cesare Santucci, Stefania Nardin, Enrico Fresch, Giulio Pietro DI Egidio, Marco Mennechelli, Chris Averis

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Abstract

Rotational cast polyurethane composition prepared from a prepolymer composition comprising: a) an isocyanate-terminated polyurethane prepolymer; and b) a curative agent comprising i) a polyol; ii) an aromatic diamine; iii) a thixotropic aliphatic amine; and iv) a thixotropic colloidal additive, wherein the prepolymer comprises a product produce by the reaction of a polyol with an organic diisocyanate monomer comprising 4,4′-diisocyanato diphenylmethane (MDI), and which prepolymer comprises less than 1.0% by weight of free MDI monomer, based on the toal weight of the prepolymer, exhibits a range of enhanced physical properties compared to those obtained from prepolymers comprising a higher level of free MDI monomer.

Claims13

Dependent claims

A polyurethane prepolymer composition comprising:

a) an isocyanate-terminated polyurethane prepolymer;
wherein the isocyanate-terminated polyurethane prepolymer comprises a reaction product of an organic diisocyanate monomer and a polyol selected from the group consisting of ethylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, 1,4-butanediol, polytetramethylene ether glycol (PTMEG), polypropylene glycol, and dihydroxypolyesters, the organic diisocyanate monomer comprises 4,4′-diisocyanato diphenylmethane (MDI), and which prepolymer comprises less than 1.0% by weight of free MDI monomer, based on the toal weight of the prepolymer,
and
b) a curative comprising i) a polyol;
ii) an aromatic diamine;
and a thixotropic agent. iii) a thixotropic aliphatic amine;
and iv) a thixotropic colloidal additive.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/107,044Filed 16 Dec 2013
Priority: 30 Jan 2013
Published: 31 Jul 2014
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

C09D 175/04
Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers: polyurethanes
B05D 1/002
Processes for applying liquids or other fluent materials: the substrate being rotated
B05D 7/26
For applying particular liquids or other fluent materials: synthetic lacquers or varnishes
C08G 18/10
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step