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US4600735A Expired / Lapsed US ⏱️ 0.0 years remaining

Soil-repellent coating composition

Assignee: Nouryon Pulp and Performance Chemicals AB
•
Filing: 1985-02-15
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Granted: 1986-07-15
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Expires: 2005-02-15
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Abstract

Abstract A soil-repellent coating composition comprising silica, polyvinyl alcohol and a wetting agent in an aqueous carrier medium. The composition is characterized in that it, in addition to the aqueous carrier medium, contains 0.5-30% by weight of silica and 0.01-6% by weight of polyvinyl alcohol, and 0.05-2.5% by weight of a wetting agent, based on the total weight of the composition. The ready-made coating composition comprises 0.05-5% by weight of silica, 0.05-0.5% by weight of polyvinyl alcohol and 0.05-0.5% by weight of the wetting agent. The silica is present in the form of an alkali stabilized, preferably ammonium stabilized silica sol with an average particle size of 4-30 nm. The polyvinyl alcohol preferably has a hydrolysis degree of 85-100% and an average molecular weight of 15,000-100,000. The weight ratio of silica to polyvinyl alcohol is above 3:1 and preferably from 5:1 to 40:1. The wetting agent preferably is nonionic. The aqueous carrier medium of the composition may comprise a water-miscible, low-boiling solvent such as ethanol in an amount of up to 20% by weight.

Inventors

  • 👤 Bernt Larsson
  • 👤 Gunilla Nobelius
  • 👤 Elisabet Johansson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 21:03
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C09; C09D; C09D129/00; C09D129/02; C09D129/04

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 95 words
A soil-repellent coating composition in an aqueous carrier medium comprising: (a) 0.5-30% by weight, based on the total weight of the composition, of silica in the form of an alkali stabilised silica sol having an average particle size 4-30 nm, (b) 0.01-6% by weight, based on the total weight of the composition, of polyvinyl alcohol, the weight ratio of silica to polyvinyl alcohol being higher than 3:1, and (c) 0.05-2.5% by weight of a wetting agent, selected from the class consisting of nonionic and anionic wetting agents, based on the total weight of the composition.
Claim 2
Dependent Claim 95 words
A soil-repellent coating composition in an aqueous carrier medium comprising: (a) 0.5-30% by weight, based on the total weight of the composition, of silica in the form of an alkali stabilised silica sol having an average particle size 4-30 nm, (b) 0.01-6% by weight, based on the total weight of the composition, of polyvinyl alcohol, the weight ratio of silica to polyvinyl alcohol being higher than 3:1, and (c) 0.05-2.5% by weight of a wetting agent, selected from the class consisting of nonionic and anionic wetting agents, based on the total weight of the composition.
Claim 3
Dependent Claim 43 words
A composition according to claim 1 wherein it is a storage composition which is to be diluted before use and contains: (a) 10-30% by weight of silica, (b) 1.0-6% by weight of polyvinyl alcohol, and (c) 0.25-2.5% by weight of a wetting agent.
Claim 4
Dependent Claim 35 words
A composition according to claim 1 wherein it is a ready-made composition containing: (a) 0.5-5% by weight of silica, (b) 0.01-1.0% by weight of polyvinyl alcohol, and (c) 0.05-0.5% by weight of a wetting agent.
Claim 5
Dependent Claim 62 words
A composition according to claim 1 wherein the alkali stabilised silica sol is stabilised with M + OH - such that the weight ratio of SiO 2 to M + as M 2 O is in the range of 20:1 I to 300:1, M + being selected from the class consisting of K + , Na + and NH 4 + .
Claim 6
Dependent Claim 16 words
A composition according to claim 4 wherein the silica sol is stabilised with NH 4 OH.
Claim 7
Dependent Claim 16 words
A composition according to claim 1 wherein the silica sol is surface modified with sodium aluminate.
Claim 8
Dependent Claim 23 words
A composition according to claim 1 wherein the weight ratio of silica to polyvinyl alcohol is in the range of 5:1 to 40:1.
Claim 9
Dependent Claim 14 words
A composition according to claim 3 wherein the silica concentration is 2-3% by weight.
Claim 10
Dependent Claim 16 words
A composition according to claim 1 wherein the polyvinyl alcohol has a hydrolysis degree of 85-100%.
Claim 11
Dependent Claim 23 words
A composition according to claim 3 wherein the aqueous carrier medium contains up to 20% by weight of a water-miscible, low-boiling, organic solvent.

References Cited (Backward Citations)

US3652379A Cited
US3594113A Cited
US3738957A Cited
US4016129A Cited
US4069176A Cited
DD140367A1 Cited
US4383057A Cited
JPS56106969A Cited
US4478909A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1989-07-14 1990-01-13 1990-07-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1993-07-14 1994-01-13 1994-07-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1997-07-14 1998-01-13 1998-07-15 $7700.00 Window Closed / Lapsed

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