Adhesive and resulting nonwoven fabric
AssigneeW. R. Grace & Co.
InventorsGlenn E. Fulmer, Louis L. Wood
Life of this patent
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Abstract
A prepolymer having a molecular weight of at least 3,000 is made from a polyether polyol where all the OH groups are capped with an aliphatic polyisocyanate. When mixed with water the prepolymer reacts to form an elastomeric cross-linked polyurethane gel adhesive which can be used to adhere fibers to from a nonwoven fabric. Examples of the aliphatic diisocyanate are IPDI (isophorone diisocyanate) and hydrogenated MDI. A catalyst can also be applied to the aqueous mixture to accelerate the adhesive binder formation.
Claims26
A method of adhering fibers to form a nonwoven fabric comprising applying to the fibers an elastomeric cross-linked polyurethane gel composition which is formed by reacting together water and a water soluble or dispersible prepolymer having a number average molecular weight of about at least 3,000 of a polyether polyol having essentially all of the OH groups capped with an aliphatic polyisocyanate.
A nonwoven fabric in which the fibers are bound together with an elastomeric cross-linked polyurethane gel composition which is formed by reacting together water and a water soluble or dispersible prepolymer having a number average molecular weight of about at least 3,000 of a polyether polyol having essentially all of the OH groups capped with an aliphatic polyisocyanate.
Dependencies are inferred from the claim text.