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US4474585A
Expired / Lapsed
US
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Synthetic yarn-reinforced flexible webs stabilized against elongation, coated abrasive thereon, and process therefor
Assignee: Saint Gobain Abrasives Inc
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Filing: 1983-05-31
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Granted: 1984-10-02
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Expires: 2003-05-31
Abstract
Abstract Conventional heat stretching and/or setting conditions for fabrics made of heat sensitive thermoplastic yarns such as polyester, and even special techniques advanced in prior patents, have been found in adequate to produce coated abrasives with sufficient elongation resistance for some very heavy duty service. A superior alternative is provided by encasing the yarns in the backing in a thermosetting adhesive and then curing it while mechanically restraining the yarns from shrinking, as they would under the temperature conditions employed for cure if no restraint were used. The method is also applicable to other types of yarn reinforced web materials for which a combination of elongation resistance and flexibility is needed.
Inventors
- 👤 David P. Gruber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:25
CPC Classifications
B; B24; B24D; B24D11/00; B24D3/00; B24D3/001; B24D3/002; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24033; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/25; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2098; Y10T442/2107; Y10T442/2115
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
80 words
A web material characterized by the presence of at least one reference direction for which the reference direction yarn set has at least one half the total tensile strength of said web material in said reference direction, said reference direction yarn set additionally having a natural shrinkage value of at least 1%, said web material having a free shrinkage of no more than 0.5% when exposed to a temperature of 121° C. for at least 10 minutes without mechanical restraint.
Claim 2
Dependent Claim
80 words
A web material characterized by the presence of at least one reference direction for which the reference direction yarn set has at least one half the total tensile strength of said web material in said reference direction, said reference direction yarn set additionally having a natural shrinkage value of at least 1%, said web material having a free shrinkage of no more than 0.5% when exposed to a temperature of 121° C. for at least 10 minutes without mechanical restraint.
Claim 3
Dependent Claim
21 words
A web according to claim 1, wherein the said reference yarn set is predominantly a substantially coplanar and coparallel yarn array.
Claim 4
Dependent Claim
27 words
A web according to claim 2, wherein said substantially coplanar and coparallel yarn array is the warp or fill yarn array of a coherent stitch bonded fabric.
Claim 5
Dependent Claim
30 words
A web according to claim 3, wherein at least half the yarns of said substantially coplanar and coparallel yarn array are polyester with a tenacity of at least 8 gm/denier.
Claim 6
Dependent Claim
40 words
A web according to claim 4, wherein said reference yarn set is encased by a layer of material which is the product of the thermal cure of a phenol-formaldehyde or resorcinol-formaldehyde resin or of the radiation cure of multifunctional acrylates.
Claim 7
Dependent Claim
40 words
A web according to claim 3, wherein said reference yarn set is encased by a layer of material which is the product of the thermal cure of a phenol-formaldehyde or resorcinol-formaldehyde resin or of the radiation cure of multifunctional acrylates.
Claim 8
Dependent Claim
40 words
A web according to claim 2, wherein said reference yarn set is encased by a layer of material which is the product of the thermal cure of a phenol-formaldehyde or resorcinol-formaldehyde resin or of the radiation cure of multifunctional acrylates.
Claim 9
Dependent Claim
40 words
A web according to claim 1, wherein said reference yarn set is encased by a layer of material which is the product of the thermal cure of a phenol-formaldehyde or resorcinol-formaldehyde resin or of the radiation cure of multifunctional acrylates.
Claim 10
Dependent Claim
91 words
A coated abrasive comprising abrasive grits adhered to at least one major surface of a web material characterized by the presence of at least one reference direction for which the reference direction yarn set has at least one half the total tensile strength of said coated abrasive in said reference direction, said reference direction yarn set also having a natural shrinkage of at least 1%, said coated abrasive having a maximum elongation of not more than 3.1% when subjected to cyclic elongation testing between 3.6 and 18.3 kN/m at 66° C.
Claim 11
Dependent Claim
91 words
A coated abrasive comprising abrasive grits adhered to at least one major surface of a web material characterized by the presence of at least one reference direction for which the reference direction yarn set has at least one half the total tensile strength of said coated abrasive in said reference direction, said reference direction yarn set also having a natural shrinkage of at least 1%, said coated abrasive having a maximum elongation of not more than 3.1% when subjected to cyclic elongation testing between 3.6 and 18.3 kN/m at 66° C.
Claim 12
Dependent Claim
23 words
A coated abrasive according to claim 9, wherein the said reference direction yarn set is predominantly a substantially coplanar and coparallel yarn array.
Claim 13
Dependent Claim
28 words
A coated abrasive according to claim 10, wherein said substantially coplanar and coparallel yarn array is the warp or fill yarn array of a coherent stitch bonded fabric.
Claim 14
Dependent Claim
31 words
A coated abrasive according to claim 11, wherein at least half the yarns of said substantially coplanar and coparallel yarn array are polyester with a tenacity of at least 8 gm/denier.
Claim 15
Dependent Claim
43 words
A coated abrasive according to claim 12, wherein said reference direction yarn set is encased by a layer of material which is the product of the thermal cure of a phenol-formaldehyde or a resorcinol-formaldehyde resin or of the radiation cure of multifunctional acrylates.
Claim 16
Dependent Claim
43 words
A coated abrasive according to claim 11, wherein said reference direction yarn set is encased by a layer of material which is the product of the thermal cure of a phenol-formaldehyde or a resorcinol-formaldehyde resin or of the radiation cure of multifunctional acrylates.
Claim 17
Dependent Claim
43 words
A coated abrasive according to claim 10, wherein said reference direction yarn set is encased by a layer of material which is the product of the thermal cure of a phenol-formaldehyde or a resorcinol-formaldehyde resin or of the radiation cure of multifunctional acrylates.
Claim 18
Dependent Claim
43 words
A coated abrasive according to claim 9, wherein said reference direction yarn set is encased by a layer of material which is the product of the thermal cure of a phenol-formaldehyde or a resorcinol-formaldehyde resin or of the radiation cure of multifunctional acrylates.
Claim 19
Dependent Claim
169 words
A process for making a web material having at least one reference direction in which the free shrinkage is no more than 0.5% upon exposure to a temperature of 121° C. for at least 10 minutes from a reference direction yarn set which has a natural shrinkage of at least 1% and at least half the total tensile strength of said web material in said reference direction, comprising the steps of: (a) encasing said reference direction yarn set, together with any adhesive impregnant or encasement previously applied to said reference yarn set, within a mass of a stablizing adhesive capable of cure to a solid state with a strain modulus and adhesion to the yarns of said set sufficient to restrain the yarns of said reference direction yarn set against more than 0.5% free shrinkage when exposed to a temperature of 121° C. for ten minutes; and (b) curing said stabilizing adhesive of part (a) while mechanically restraining the yarns of said reference direction yarn set from any shrinkage.
Claim 20
Dependent Claim
169 words
A process for making a web material having at least one reference direction in which the free shrinkage is no more than 0.5% upon exposure to a temperature of 121° C. for at least 10 minutes from a reference direction yarn set which has a natural shrinkage of at least 1% and at least half the total tensile strength of said web material in said reference direction, comprising the steps of: (a) encasing said reference direction yarn set, together with any adhesive impregnant or encasement previously applied to said reference yarn set, within a mass of a stablizing adhesive capable of cure to a solid state with a strain modulus and adhesion to the yarns of said set sufficient to restrain the yarns of said reference direction yarn set against more than 0.5% free shrinkage when exposed to a temperature of 121° C. for ten minutes; and (b) curing said stabilizing adhesive of part (a) while mechanically restraining the yarns of said reference direction yarn set from any shrinkage.
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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) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |