Polyurethanes, reactive solutions and methods and their production
OwnerPaul Stambergerinventor
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Abstract
A reactive, stable dispersion can be prepared by the in situ polymerization of an ethylenically unsaturated monomer in an appropriate reactive medium such as a polyol. The in situ polymerization produces a dispersed polymer containing reactive radicals. The stable dispersion can be employed in any of a number of reactions, e.g., polyurethane-forming reactions, to introduce into the resultant product, as an integral part thereof, both the polyol and dispersed polymer.
Claims32
A method for preparing reactive compositions convertible to elastic polyurethane products [by] comprising the steps of
- (a) dispersing a minor amount of ethylenically unsaturated monomer in a major amount of a solvent medium, said solvent medium consisting essentially of at least one normally liquid polyol essentially free from ethylenic unsaturation and having a molecular weight of at least about 2,000 and a hydroxyl number in the range of about 30 to about [140] 600, said hydroxyl number being appropriate to provide an elastic polyurethane, and
- (b) polymerizing said monomer in said solvent by free radical addition polymerization to a substantially linear polymer having a molecular weight of at least 5,000 to provide a liquid, stable dispersion of polymerpolyol having a viscosity of less than 40,000 cps at 10% polymer concentration.
- said substantially linear polymer being film-forming and having radicals reactive with isocyanate radicals, said reactive composition being convertible to an elastic polyurethane product upon reaction with an organic polyisocyanate.
A reactive composition convertible to an elastic polyurethane product having improved load bearing properties by reaction with an organic polyisocyanate, said reactive composition being produced by a method comprising the steps of
- (a) dispersing a minor amount of ethylenically unsaturated monomer in a major amount of a solvent medium, said solvent medium consisting essentially of at least one normally liquid polyoxypropylene polyol essentially free from ethylenic unsaturation and having a molecular weight of at least about 2,000 and a hydroxyl number in the range of about 30 to about 600, said hydroxyl number being appropriate to provide an elastic polyurethane, and
- (b) polymerizing said monomer in said solvent by free radical addition polymerization to a substantially linear polymer having a molecular weight of at least 10,000 to provide a liquid, stable dispersion of polymer polyol having a viscosity of less than 40,000 cps at 10% polymer concentration,
- said substantially linear polymer being film-forming and having radicals reactive with isocyanate radicals, said reactive composition having a combining weight in the range providing an elastic polyurethane product upon reaction with an organic polyisocyanate.
Dependencies are inferred from the claim text.