US4877829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid coatings for bridge deckings and the like
Assignee: WR Grace and Co Conn
•
Filing: 1988-05-19
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Granted: 1989-10-31
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Expires: 2008-05-19
Abstract
Abstract Novel polyurethane formulations especially useful as membranes for the protection of bridge deckings. The polyurethane is prepared by mixing two components, A and B. Component A comprises castor oil, a low molecular weight polyol having a molecular wieght between 92 and about 200, preferably with an elastomer. Component B is a modified MDI, being either (i) a mix of 4,4'- and 2,4'-isomers of diphenylmethane diisocyanate or (ii) a diphenylmethane diisocyanate and its reaction product with a low molecular weight poly(oxyalkylene).
Inventors
- 👤 Cung Vu
- 👤 Timothy J. Martin
- 👤 Andrew M. Gillanders
- 👤 Bassam Sbaiti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:01
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/69; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/46; C04B41/48; C04B41/488; C04B41/4884; C04B41/52; C04B41/60; C04B41/61; C04B41/62; C04B41/63; C04B41/70; C04B41/71; C08G18/08; C08G18/088; C08G18/0885; C08G18/30; C08G18/36; C08G18/65; C08G18/6547; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G18/80; C08G18/8003; C08G18/8006; C08G18/8009; C08G18/8012; C08G18/8019; E; E01; E01D; E01D19/00; E01D19/08; E01D19/083; C04B2111/00; C04B2111/00241; C04B2111/00267; C04B2111/20; C04B2111/27; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31598
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
104 words
Composition consisting essentially of two separate components, A and B; Component A consisting essentially of, in parts by weight, (i) about 90 - 140 parts of castor oil; (ii) a low molecular weight polyol having at least 3 hydroxyl groups and a molecular weight between 92 and about 200, 2 - 10 parts; and (ii) an elastomer, about 0 - 120 parts; Component B, about 40 - 120 parts; being a polyisocyanate of the group consisting of (i) isomers of diphenylmethane diisocyanate and (ii) a mixture of diphenylmethane diisocyanate and the reaction product of diphenylmethane diisocyanate with an alkylene oxide adduct of a polyol.
Claim 2
Dependent Claim
104 words
Composition consisting essentially of two separate components, A and B; Component A consisting essentially of, in parts by weight, (i) about 90 - 140 parts of castor oil; (ii) a low molecular weight polyol having at least 3 hydroxyl groups and a molecular weight between 92 and about 200, 2 - 10 parts; and (ii) an elastomer, about 0 - 120 parts; Component B, about 40 - 120 parts; being a polyisocyanate of the group consisting of (i) isomers of diphenylmethane diisocyanate and (ii) a mixture of diphenylmethane diisocyanate and the reaction product of diphenylmethane diisocyanate with an alkylene oxide adduct of a polyol.
Claim 3
Dependent Claim
61 words
Composition according to claim 1, wherein Component B, (i) is a mixture comprising 4,4'-diphenylmethane diisocyanate and, 2,4'-diphenylmethane diisocyanate wherein the 4,4'-isomer is in the majority; and (ii) is a polyisocyante material comprising about 45-50 weight % to make 100% of a polyisocyanate of the structure K-O-(CH 2 CH[CH 3 ]O) m -K, where K is ##STR5## and m is about 2-5.
Claim 4
Dependent Claim
41 words
Composition according to claim 1, wherein the elastomer is polybutadiene or an acrylonitrile-butadiene copolymer; and the weight ratio of castor oil: low molecular weight polyol: elastomer:Component B is about 100 - 130: 3 - 8: 20 - 100: 50 - 110.
Claim 5
Dependent Claim
40 words
The composition of claim 1 wherein Component A contains in addition at least one additive selected from the group consisting of polyurethane catalyst, polyurethane inhibitor, molecular sieves, thixotropic agents, anti-oxidants, reinforcing agents, plasticizers, UV stabilizers, pigments, fillers, and corrosion inhibitors.
Claim 6
Dependent Claim
13 words
The composition according to claim 4 in which the additive is molecular sieves.
Claim 7
Dependent Claim
17 words
Composition according to claims 1, 2, 3, 4, or 5 wherein Component B is group member (i).
Claim 8
Dependent Claim
57 words
Composition according to claim 6 wherein group member (i) consists essentially of about 60-70% (a) and about 30-40% (b), wherein (a) comprises about 88% 4,4'-diphenylmethane diisocyanate and about 12% 2,4'-diphenylmethane diisocyanate and (b) comprises polymeric MDI of the formula ##STR6## having a functionality of 2.3, wherein n is a variable in the range of 1 to 3.
Claim 9
Dependent Claim
16 words
Composition according to claims 1, 2, 3, or 4, wherein Component B is group member (ii).
Claim 10
Dependent Claim
48 words
Composition according to claim 8 where Component B is a polyisocyanate material comprising about 45-50 weight % of 4,4'- or 2,4'-diphenylmethane and balance to make 100%, of a polyisocyanate of the structure K-0-(CH 2 CH[CH 3 ]0) m -K, where K is ##STR7## and m is about 2-5.
Claim 11
Dependent Claim
58 words
Composition according to claim 1 wherein in parts by weight, ______________________________________
Component A consists essentially of:
Castor oil, about 100;
Glycerol, about 6.2;
Polybutadiene, about 25;
Molecular sieves in
castor oil, 1:1, about 40
CaCO.sub.3 40;
Cr.sub.2 O.sub.3 3.2;
Fumed silica 1.8;
Dibutyl tin dilaurate 0.47; and
Component B consists essentially of group
member (ii), about 107.8.
______________________________________
Claim 12
Dependent Claim
22 words
A polyurethane resin, said resin being the product obtained by reacting together Component A and Component B as defined in claim 1.
Claim 13
Dependent Claim
17 words
Polyurethane resin according to claim 11 wherein Components A and B are as defined in claim 2.
Claim 14
Dependent Claim
17 words
Polyurethane resin according to claim 12 wherein Components A and B are as defined in claim 10.
Claim 15
Dependent Claim
20 words
Process of forming a polyurethane resin comprising intimately mixing together two components, A and B, as defined in claim 1.
Claim 16
Dependent Claim
17 words
Process according to claim 14 wherein Component A and Component B are as defined in claim 2.
Claim 17
Dependent Claim
17 words
Process according to claim 15 wherein Component A and Component B are as defined in claim 10.
Claim 18
Dependent Claim
13 words
Process of coating a substrate comprising applying thereto the resin of claim 11.
Claim 19
Dependent Claim
13 words
Process according to claim 14 wherein the resin is that of claim 12.
Claim 20
Dependent Claim
13 words
Process according to claim 14 wherein the resin is that of claim 13.
Claim 21
Dependent Claim
13 words
Process according to claim 17, 18 or 19 wherein the substrate is concrete.
Claim 22
Dependent Claim
13 words
Process according to claim 17, 18 or 19 wherein the substrate is metal.
Claim 23
Dependent Claim
11 words
Process according to claim 20 wherein the concrete is bridge decking.
Claim 24
Dependent Claim
19 words
Article comprising a substrate and a film coating adhered thereon, said film coating comprising the resin of claim 11.
Claim 25
Dependent Claim
15 words
Article according to claim 23 wherein the film coating comprises the resin of claim 12.
Claim 26
Dependent Claim
15 words
Article according to claim 23 wherein the film coating comprises the resin of claim 13.
Claim 27
Dependent Claim
13 words
Article according to claim 23, 24 or 25 wherein the substrate is concrete.
Claim 28
Dependent Claim
13 words
Article according to claim 23, 24 or 25 wherein the substrate is metal.
Claim 29
Dependent Claim
12 words
Article according to claim 25 wherein the concrete substrate is bridge decking.
Claim 30
Dependent Claim
51 words
Process of aiding in the protection of concrete bridge decking from damage due to traffic, road salt, weather, and associated injury-sources, wherein a polyurethane membrane is applied to the surface of the concrete decking followed by an asphalt layer; characterized in that the polyurethane is the resin defined in claim 11.
Claim 31
Dependent Claim
15 words
Process according to claim 29 in which the polyurethane is the resin of claim 12.
Claim 32
Dependent Claim
15 words
Process according to claim 29 in which the polyurethane is the resin of claim 13.
Claim 33
Dependent Claim
25 words
Article comprising concrete bridge decking having a layer of polyurethane resin of claim 11 applied thereon, plus a layer of asphalt on the resin layer.
Claim 34
Dependent Claim
14 words
Article according to claim 32 wherein the resin is the resin of claim 12.
Claim 35
Dependent Claim
14 words
Article according to claim 32 wherein the resin is the resin of claim 13.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |