US4645782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Putty or mastic
Assignee: Dixon International Ltd
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Filing: 1983-10-06
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Granted: 1987-02-24
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Expires: 2003-10-06
Abstract
Abstract An intumescent putty or mastic is produced by admixing fine particles of solid intumescent material, polyvinyl butyral and a volatile solvent. The intumescent material can optionally be ground scrap intumescent door seals.
Inventors
- 👤 Cyril A. Redfarn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:04
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/20; C08L61/26; C08L61/28; C08L29/00; C08L29/14; C08L31/00; C08L31/02; C08L31/04; C09; C09D; C09D129/00; C09D129/14; C09D5/00; C09D5/34
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
39 words
A composition suitable for use as a putty or mastic comprising, a substantially uniformly dispersed solid phase comprising fine particles of solid intumescent material and a continuous phase comprising a solution of polyvinyl butyral in a volatile solvent therefor.
Claim 2
Dependent Claim
39 words
A composition suitable for use as a putty or mastic comprising, a substantially uniformly dispersed solid phase comprising fine particles of solid intumescent material and a continuous phase comprising a solution of polyvinyl butyral in a volatile solvent therefor.
Claim 3
Dependent Claim
16 words
A composition according to claim 1, wherein the solid phase comprises a carbonific and a spumific.
Claim 4
Dependent Claim
24 words
A composition according to claim 2 wherein the solid phase further comprises an activator for promoting the decomposition of said carbonific and said spumific.
Claim 5
Dependent Claim
17 words
A composition according to claim 1, wherein the solid phase further comprises a binder in particulate form.
Claim 6
Dependent Claim
13 words
A composition according to claim 2, wherein the carbonific is a polyhydroxy compound.
Claim 7
Dependent Claim
13 words
A composition according to claim 2, wherein the spumific is dicyandiamide or guanidine.
Claim 8
Dependent Claim
13 words
A composition according to claim 3, wherein the activator is an ammonium phosphate.
Claim 9
Dependent Claim
13 words
A composition according to claim 4, wherein the binder comprises melamine formaldehyde resin.
Claim 10
Dependent Claim
16 words
A composition according to claim 4, wherein the binder further comprises acetate polymer as additional binder.
Claim 11
Dependent Claim
15 words
A composition according to claim 1, further comprising a plasticizing agent for said polyvinyl butyral.
Claim 12
Dependent Claim
18 words
A composition according to claim 1, wherein the fine particles have a size less than the 125 microns.
Claim 13
Dependent Claim
16 words
A composition according to claim 11, wherein the particles have a size less than 75 microns.
Claim 14
Dependent Claim
11 words
A composition according to claim 1, wherein the solvent comprises 1,1,1-trichloroethane.
Claim 15
Dependent Claim
20 words
A composition according to claim 8, wherein the melamine formaldehyde resin is crosslinked and/or the composition contains a crosslinking agent.
Claim 16
Dependent Claim
24 words
A composition according to claim 8, wherein the melamine formaldehyde resin is crosslinked by and/or the composition contains dicyandiamide or guanidine as crosslinking agent.
Claim 17
Dependent Claim
14 words
A composition according to claim 7, wherein the ammonium phosphate is monoammonium dihydrogen phosphate.
Claim 18
Dependent Claim
15 words
A composition according to claim 5, wherein the polyhydroxy compound is pentaerythritol or a sugar.
Claim 19
Dependent Claim
23 words
A composition according to claim 1, wherein the solvent includes one or more of diacetone alcohol, methyl ethyl ketone, methyloxitol and isopropyl alcohol.
Claim 20
Dependent Claim
35 words
A method of making a composition according to claim 1, comprising mixing fine particles of a carbonific, a spumific, an activator and a binder with a solution of polyvinyl butyral in a volatile solvent therefor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |