US4330634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam composites
Assignee: DNLOP Ltd
•
Filing: 1980-11-24
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Granted: 1982-05-18
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Expires: 2000-11-24
Abstract
Abstract The invention relates to the production of foam composites which are thermally insulating and light and therefore suitable for use as e.g. ceiling tiles, wall tiles and brick insulation. The aim of the invention is to produce a light, strong composite as cheaply as possible. The method comprises reacting, in the presence of water and poly(vinyl alcohol), hollow silica spheres with a water-soluble organic polyacid and then allowing or causing the resulting composite to set.
Inventors
- 👤 Bruce K. Rodaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:15
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/35
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
46 words
A composite comprising hollow silica spheres having a silica content from 40 to 70% by weight and a size range of 0.03 to 0.0005 CM. in an organic polyacid foam matrix containing poly(vinyl alcohol), wherein said organic polyacid is a polymer of an organic carboxylic acid.
Claim 2
Dependent Claim
46 words
A composite comprising hollow silica spheres having a silica content from 40 to 70% by weight and a size range of 0.03 to 0.0005 CM. in an organic polyacid foam matrix containing poly(vinyl alcohol), wherein said organic polyacid is a polymer of an organic carboxylic acid.
Claim 3
Dependent Claim
30 words
A composite according to claim 1, wherein the proportion by weight of hollow silica spheres is in the range 80% to 97.5% based on the total weight of the composite.
Claim 4
Dependent Claim
30 words
A composite according to claim 1, wherein the proportion by weight of hollow silica spheres is in the range 90% to 95% based on the total weight of the composite.
Claim 5
Dependent Claim
24 words
A composite according to claim 1, 2 or 3, wherein the polyacid has an average molecular weight of from 3,500 to 20×10 6 .
Claim 6
Dependent Claim
24 words
A composite according to claim 1, 2 or 3, wherein the polyacid has an average molecular weight of from 76,000 to 13.2×10 6 .
Claim 7
Dependent Claim
18 words
A composite according to claim 1, 2 or 3, wherein the polyacid is a polymer of acrylic acid.
Claim 8
Dependent Claim
23 words
A composite according to claim 1, 2 or 3, wherein the void content of the composite is from 90% to 99% by volume.
Claim 9
Dependent Claim
18 words
A composite according to claim 1, 2 or 3, wherein the polyacid foam matrix also contains poly(vinyl acetate).
Claim 10
Independent Claim
75 words
A method of making a composite comprising hollow silica spheres having a silica content from 40 to 70% by weight and a size range of 0.03 to 0.0005 CM. in an organic polyacid foam matrix comprising reacting, in the presence of water and poly(vinyl alcohol), hollow silica spheres with a water-soluble organic polyacid and then allowing or causing the resulting composite to set wherein said organic polyacid is a polymer of an organic carboxylic acid.
Claim 11
Independent Claim
75 words
A method of making a composite comprising hollow silica spheres having a silica content from 40 to 70% by weight and a size range of 0.03 to 0.0005 CM. in an organic polyacid foam matrix comprising reacting, in the presence of water and poly(vinyl alcohol), hollow silica spheres with a water-soluble organic polyacid and then allowing or causing the resulting composite to set wherein said organic polyacid is a polymer of an organic carboxylic acid.
Claim 12
Dependent Claim
30 words
A method according to claim 9, wherein mechanical agitation is applied to an aqueous solution of the polyacid containing poly(vinyl alcohol) prior to the addition of the hollow silica spheres.
Claim 13
Dependent Claim
18 words
A method according to claim 9 or 10, wherein a blowing agent is included in the reaction mixture.
Claim 14
Dependent Claim
18 words
A method according to claim 9 or 10, wherein a chelating agent is included in the reaction mixture.
Claim 15
Dependent Claim
32 words
A method according to claim 9 or 10, wherein the polyacid is incorporated in the reaction mixture as a precursor which will be transformed into the required polyacid in contact with water.
Claim 16
Dependent Claim
18 words
A method according to claim 10 having the features defined in any one of claims 1 to 3.
References Cited (Backward Citations)
GB1138473A
Cited
GB983518A
Cited
GB1122403A
Cited
GB1139430A
Cited
GB1301175A
Cited
GB1316129A
Cited
US3775351A
Cited
US4137198A
Cited
GB1422337A
Cited
GB1448042A
Cited
GB1484454A
Cited
US3965051A
Cited
GB1532954A
Cited
DE2537803A1
Cited
GB1548419A
Cited
GB1548420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |