Patent ID: 6508898
Filing Date: 2003-01-21
Classification: B29C,B29D,B29K,B29L,B60C,Y10T

Abstract:
A method for producing a heat stable self-sealing pneumatic tire liner, which comprises:(a) mixing the following two component system: (i) an isocyanate component comprising a polyisocyanate; a polyol comprising a blend of a high molecular weight diol having a hydroxyl number in the range of about 13 to about 25, a hydroxyl functionality of about 2 and a high molecular weight triol having a hydroxyl number in the range of about 24 to about 31 with a hydroxyl functionality of about 2.2 to about 2.9; and about 10 to about 30 parts by weight of a plasticizer based on a total of 100 parts of said two component system of a plasticizer of which about 4 to about 20 parts by weight is a phosphorous-containing plasticizer selected from the group consisting of an aromatic phosphate, a phosphonate, and mixtures thereof; (ii) a polyol component comprising said polyol; and about 10 to about 20 parts by weight based on a total of 100 parts of said two component system of said plasticizer; â€ƒin the presence of a catalyst to form a soft polyurethane elastomer; (b) curing said elastomer; (c) recovering a soft polyurethane elastomeric liner composition that is self-sealing in the event of a pneumatic tire puncture and can withstand temperatures of up to about 290Â° F.; and (d) using the recovered composition as a self-sealing tire liner.