US3987228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pile surfaced materials
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1975-02-27
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Granted: 1976-10-19
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Expires: 1995-02-27
Abstract
Abstract A process of forming pile surfaced material comprising drawing fibrils from the surface of a cross-linkable thermoplastic material and cross-linking the thermoplastic while maintaining the fibrils in a self-supporting position.
Inventors
- 👤 Malcolm Hemming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:56
CPC Classifications
D; D04; D04H; D04H11/00; D04H11/08; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/2395; Y10T428/23957; Y10T428/23993
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
82 words
A process for the production of pile surfaced material comprising interposing a cross-linkable thermoplastic material between a backing material and a surface heat to a temperature at which the thermoplastic adheres thereto, withdrawing the backing material from the heated surface with the thermoplastic adherent thereto so that the thermoplastic is drawn into fibrils between the surface and the backing material, rendering the fibrils self supporting and separating them from the heated surface and subsequently cross-linking the thermoplastic while maintaining the fibrils self-supporting.
Claim 2
Dependent Claim
82 words
A process for the production of pile surfaced material comprising interposing a cross-linkable thermoplastic material between a backing material and a surface heat to a temperature at which the thermoplastic adheres thereto, withdrawing the backing material from the heated surface with the thermoplastic adherent thereto so that the thermoplastic is drawn into fibrils between the surface and the backing material, rendering the fibrils self supporting and separating them from the heated surface and subsequently cross-linking the thermoplastic while maintaining the fibrils self-supporting.
Claim 3
Dependent Claim
22 words
A process according to claim 1 in which the heated surface is a roller having a substantially smooth surface as hereinbefore described.
Claim 4
Dependent Claim
35 words
A process according to claim 1 in which the thermoplastic and the backing material are fed separately to the heated surface whose temperature is such that the thermoplastic is melted and bonds to the backing.
Claim 5
Dependent Claim
35 words
A process according to preceding claim 1 in which the fibrils are rendered self supporting by cooling and solidification of the thermoplastic material and in which the material is maintained solid during the cross-linking step.
Claim 6
Dependent Claim
18 words
A process according to claim 4 in which the cooling is achieved by a stream of cold gas.
Claim 7
Dependent Claim
37 words
A process according to claim 5 in which the stream of cold gas is directed against the side of the backing material remote from the heated surface and passes through the backing into the fibril forming area.
Claim 8
Dependent Claim
32 words
A process according to claim 1 in which the thermoplastic contains a cross-linking agent which is not activated during pile formation but may be activated after pile formation to cross-link the thermoplastic.
Claim 9
Dependent Claim
13 words
A process according to claim 7 in which the cross-linking agent is photo-activated.
Claim 10
Dependent Claim
24 words
A process according to claim 8 in which the cross-linking agent is a mixture of a photo-initiator and one or more polyfunctional cross-linking agents.
Claim 11
Dependent Claim
37 words
A process according to claim 9 in which the thermoplastic contains up to 1 percent by weight of the thermoplastic of the photo-initiator and up to 5 percent by weight of the thermoplastic of the cross-linking agent.
Claim 12
Dependent Claim
17 words
A process according to claim 1 in which the thermoplastic is cross-linked by exposure to ultra-violet light.
Claim 13
Dependent Claim
18 words
A process according to claim 1 in which the thermoplastic is cross-linked by exposure to high energy irradiation.
Claim 14
Dependent Claim
27 words
A process according to claim 12 in which the high energy irradiation is from an electron accelerator giving a dose in the range 5 to 30 megarads.
Claim 15
Dependent Claim
16 words
A process according to claim 1 in which only certain areas of the pile are cross-linked.
Claim 16
Dependent Claim
23 words
A process according to claim 14 in which those areas of pile which are not to be cross-linked are masked during radiation cross-linking.
Claim 17
Dependent Claim
11 words
A pile surfaced material made by the process of claim 1.
References Cited (Backward Citations)
US3600260A
Cited
US3708565A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |