US3801421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resilient composite useful as surfacing for athletics
Assignee: 3M Co
•
Filing: 1970-11-09
•
Granted: 1974-04-02
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Expires: 1990-11-09
Abstract
Abstract A resilient composite material useful, for example, in the form of a layer as a surfacing or paving for athletic activities, comprising particulate vulcanized rubber bonded with polyisocyanurate resin.
Inventors
- 👤 M Allen
- 👤 T Buchholtz
- 👤 Dyke Tiers G Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:44
CPC Classifications
E; E01; E01C; E01C13/00; E01C13/06; E01C13/065; C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; E01C13/04; E01C13/045; E01C13/08; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S528/00; Y10S528/905; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23986; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249985; Y10T428/25; Y10T428/31504; Y10T428/31551; Y10T428/31569; Y10T428/31573; Y10T428/31587; Y10T428/31826
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
12 words
The composite of claim 1 wherein said NCO/OH equivalent ratio is 2/1.
Claim 2
Dependent Claim
11 words
A surfacing comprising a layer of the composite of claim 1.
Claim 3
Dependent Claim
19 words
The surfacing of claim 3 further comprising one or more laminae of polymeric material overlying said layer of composite.
Claim 4
Dependent Claim
12 words
The surfacing of claim 4 wherein the uppermost lamina has non-slip characteristics.
Claim 5
Dependent Claim
17 words
The surfacing of claim 4 wherein the uppermost lamina has rubbery aggregate embedded therein to provide traction.
Claim 6
Dependent Claim
15 words
The surfacing of claim 3 wherein the uppermost lamina comprises a layer of pile fabric.
Claim 7
Dependent Claim
24 words
The surfacing of claim 7 wherein a layer of energy-absorbing material is interposed between said layer of composite and said layer of pile fabric.
Claim 8
Dependent Claim
13 words
The surfacing of claim 8 wherein said energy absorbing material comprises foamed plastic.
Claim 9
Dependent Claim
40 words
The composite according to claim 1 wherein said binder is formed by heating in the presence of said particles a mixture comprising polymethylene polyphenylene polyisocyanate and polypropylene ether in the presence of polyether polyol solution of monosodium dipropylene glycol xanthate.
Claim 10
Dependent Claim
26 words
The composite according to claim 1 wherein said vulcanized rubber particles are those obtained by abrading or shredding pneumatic tires made of natural rubber and SBR.
Claim 11
Independent Claim
160 words
A method of making a flexible, resilient, elastomeric, water permeable composite having 15 to 75 volume percent void space, comprising partially or wholly coating vulcanized rubber particles with an essentially solvent-free, liquid reaction mixture comprising polyisocyanate, polyoxyalkylene polyol having a hydroxyl equivalent weight of 400 to 1,000, and trimerizing catalyst, said reaction mixture having an NCO/OH equivalent ratio of 2/1 to 12/1, shaping the resulting mass of coated particles, and curIng said reaction mixture to form a crosslinked binder to bond said vulcanized rubber particles, said binder having a plurality of isocyanurate and urethane linkages, about 20 to 85 percent of the isocyanate groups in said reaction mixture being converted to said isocyanurate linkages which impart thermal stability and hydrolytic stability to said binder, the amount of said vulcanized rubber particles being 50 to 95 weight percent and the amount of said binder being 5 to 50 weight percent, said amounts being based on the total weight of said composite.
Claim 12
Dependent Claim
38 words
The method according to claim 12, wherein said polyisocyanate comprises polymethylene polyphenyl polyisocyanate, said polyol comprises polypropylene ether glycol, and said catalyst comprises a xanthate salt, said reaction mixture having an NCO/OH equivalent ratio of 2/1 to 6/1.
Claim 13
Dependent Claim
15 words
The method according to claim 13 wherein said xanthate salt is mono-sodium dipropylene glycol xanthate.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |