Solvent-based, one-part, filled polyurethane for flexible parts
AssigneeMinnesota Mining and Manufacturing Company
InventorJohn J. Theodore
Life of this patent
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Abstract
A one part composition useful as a putty for filling recessed areas in flexible parts of damaged auto bodies and the like is provided. The curable composition has a viscosity in the range of 50,000 to 450,000 cps and comprises by volume 6 to 25 parts binder comprising substantially non-reactive solvent-soluble polyurethane, 43 to 68 parts solvent for the binder and 20 to 42 parts talc filler. Other fillers may also be included. The preferred polyurethane binder is a linear polyurethane elastomer which is substantially free of cross-links and has an elongation at break value in the range of 300-850% and a tensile strength in the range of 1,500 to 7,000 psi.
Claims5
A one-part composition curable upon solvent evaporation having particular utility in providing a putty for use in filling recessed areas in flexible parts of damaged auto bodies and the like, said composition having a viscosity in the range of 50,000 to 450,000 cps and comprising by volume:
- (a) 6-25 parts of a binder comprising substantially non-reactive solvent-soluble polyurethane having an elongation at break value of at least 175%;
- (b) 43-68 parts solvent for said binder, which solvent will not substantially swell the flexible part being repaired;
- and
- (c) 20-42 parts by volume talc filler having an average particle size less than about 20 microns.
Dependencies are inferred from the claim text.