US4451605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent-based, one-part, filled polyurethane for flexible parts
Assignee: 3M Co
•
Filing: 1982-05-07
•
Granted: 1984-05-29
•
Expires: 2002-05-07
Abstract
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.
Inventors
- 👤 John J. Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/12; C08; C08K; C08K3/00; C08K3/34; Y; Y10; Y10S; Y10S524/00; Y10S524/919
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
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.
Claim 2
Dependent Claim
104 words
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.
Claim 3
Dependent Claim
35 words
The composition of claim 1 also include particulate filler selected from the group consisting of calcium carbonate, carbon black, silica, aluminum oxide, zinc, aluminum, wollanstonite, barium sulfate, mica, tripoli, diatomaceous earth, clay and mixtures thereof.
Claim 4
Dependent Claim
18 words
The composition of claim 2 wherein said silica filler is in the form of minute hollow glass bubbles.
Claim 5
Dependent Claim
17 words
The composition of claim 1 wherein said polyurethane is a linear polyurethane elastomer substantially free of cross-links.
Claim 6
Dependent Claim
32 words
The composition of claim 1 wherein said polyurethane has an elongation at break value in the range of 300-850% and a tensile strength in the range of about 1,500 to 7,000 psi.
References Cited (Backward Citations)
US3873475A
Cited
US3737405A
Cited
US4289813A
Cited
US4009145A
Cited
US4053448A
Cited
US4150211A
Cited
JPS551963A
Cited
US4187348A
Cited
US4273700A
Cited
US4281078A
Cited
JPS56163147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |