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US 4,367,259 AGranted
Sound deadening material
AssigneeW. R. Grace & Co.
InventorsGlenn E. Fulmer, Louis L. Wood
Life of this patent
Estimating the term…
Abstract
A sound deadening material is obtained with a very high loading of sound damping materials such as barium sulfate, calcium carbonate or metal powders. These materials are mixed with water and are bound together by adding a water-miscible isocyanate-terminated prepolymer which reacts with the water to form a cross-linked binder.
Claims18
A sound deadening material comprising
- (a) an elastomeric cross-linked polyurethane binder and
- (b) substantial amounts of sound deadening particles incorporated therein,
- werein the weight ratio of b to a is at least 10 which is made by reacting together an aqueous slurry of sound deadening particles and a water-miscible prepolymer which reacts with the water to form elastomeric cross-linked polyurethane binder.
A method of producing a sound deadening, elastomer cross-linked polyurethane composition by reacting together:
- (a) a water-miscible prepolymer of a polyether polyol capped with polyisocyanates having a number average molecular weight of about at least 2,000 and
- (b) an aqueous slurry containing sound deadening particles,
- said prepolymer being present in the reaction in an amount of 1-100 parts by weight per 100 parts of water.
Dependencies are inferred from the claim text.