US4876153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of cyanate resin-based prepregs and films which maintain their tack
Assignee: Cytec Technology Corp
•
Filing: 1988-02-29
•
Granted: 1989-10-24
•
Expires: 2008-02-29
Abstract
Abstract Cyanate-functional resin adhesives, matrix resin films and prepregs which maintain their tack for extended periods may be prepared using silicone coated release film containing low levels of residual metal catalyst, or which have had their silicone coating prepared in the absence of such catalysts.
Inventors
- 👤 Bradley S. Thorfinnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:12
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/64; B29C33/68; B29C37/00; B29C37/0067; B29C37/0075; C; C08; C08J; C08J5/00; C08J5/24; C08J5/249; B29K; B29K2083/00; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2839; Y10T428/31504; Y10T428/31511; Y10T428/31533; Y10T428/31652; Y10T428/31663; Y10T428/31721; Y10T428/31725; Y10T428/31855; Y10T428/31942
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
75 words
A multiple layer composition comprising: (a) a first layer of heat-curable resin which comprises a cyanate-functional resin; (b) at least a second layer which is a silicone coated release film removably adherent to said cyanate-functional resin layer; wherein said silicone coating contains an amount of residual metal catalyst which is effective to cause no greater than a 2.5-fold increase in said heat-curable resin viscosity after storage of said composition at room temperature for one week.
Claim 2
Dependent Claim
75 words
A multiple layer composition comprising: (a) a first layer of heat-curable resin which comprises a cyanate-functional resin; (b) at least a second layer which is a silicone coated release film removably adherent to said cyanate-functional resin layer; wherein said silicone coating contains an amount of residual metal catalyst which is effective to cause no greater than a 2.5-fold increase in said heat-curable resin viscosity after storage of said composition at room temperature for one week.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein said residual catalyst is selected from the group consisting of heavy metal and precious metal catalysts.
Claim 4
Dependent Claim
45 words
The composition of claim 2 wherein said cyanate-functional resin is selected from the group consisting of di- and tricyanatobenzene, di- and tricyanatonaphthalene, 2,2'-, 2,4'-, and 4,4'dicyanatobiphenyl, 2,2'-, 2,4'-, 3,3'-, and 4,4'-dicyanatodiphenylmethane, 2,2-bis(4-cyanatophenyl)propane, bis(4-cyanatophenyl)ether, bis(4-cyanato-phenyl)thioether, bis(4-cyanatophenyl)sulfone, cyanato derivatized novolaks, prepolymers of these monomers, and mixtures thereof.
Claim 5
Dependent Claim
27 words
The composition of claim 3 wherein said first layer additionally comprises a heat-curable resin selected from the group consisting of epoxy resins, maleimide-group-containing resins, and mixtures thereof.
Claim 6
Dependent Claim
14 words
The composition of claim 4 wherein said first layer additionally comprises an unsaturated monomer.
Claim 7
Dependent Claim
14 words
The composition of claim 5 wherein said unsaturated monomer is a multiply unsaturated monomer.
Claim 8
Dependent Claim
34 words
The composition of claim 6 wherein said multiply unsaturated monomer is selected from the group consisting of diallylphthalate, diallylbisphenol A, diallylbisphenol F, diallylbisphenol S, dipropenylbisphenol A, dipropenylbisphenol F, dipropenylbisphenol S, and acetylene-group terminated polyimides.
Claim 9
Dependent Claim
16 words
The composition of claim 4 wherein said heat curable resin additionally comprises an amino group-containing monomer.
Claim 10
Dependent Claim
42 words
The composition of claim B wherein said amino group-containing monomer is selected from the group consisting of 1,4-phenylenediamine, 1,3- and 1,4-xylylenediamine, 2,2'-, 2,4'-, 3,3'-, and 4,4'-diaminodiphenylmethane, 2,2'-, 2,4'-, 3,3'-, and 4,4'-diaminodiphenylsulfone, 2,2'-, 2,4'-, 3,3'-, and 4,4'-diaminodiphenyloxide, and 2,2-bis(4aminophenyl)propane and polymethylene polyphenylene polyamines.
Claim 11
Dependent Claim
41 words
The composition of claim 4 wherein said maleimide group-containing resin is selected from the group consisting of the bismaleimides of 1,4-phenylenediamine, 1,3- and 1,4-xylylenediamine, 2,2'-, 2,4'-, 3,3'-, and 4,4'diaminodiphenylmethane, 2,2'-, 2,4'-, 3,3'-, and 4,4'diaminodiphenylsulfone, 2,2'-, 2,4'-, 3,3'-, and 4,4'diaminodiphenyloxide, and 2,2-bis(4-aminophenyl)propane.
Claim 12
Dependent Claim
25 words
The composition of claim 2 wherein said precious metal catalyst is selected from the group consisting of platinum, palladium, rhodium, their compounds, and mixtures thereof.
Claim 13
Dependent Claim
23 words
The composition of claim 2 wherein said heavy metal catalyst is selected from the group consisting of compounds of zinc, lead, and tin.
Claim 14
Dependent Claim
38 words
The composition of claim 12 wherein said heavy metal catalyst is present in a concentration which causes the relative heavy metal count as determined by x-ray fluorescence spectrometry to be no more than about double the background count.
Claim 15
Dependent Claim
30 words
The composition of claim 1 wherein said first layer additionally contains fiber reinforcement selected from the group consisting of carbon/graphite, silicon carbide fiberglass, aramid, polyester, nylon, polybenzimidazole, polyethylene and polypropylene.
Claim 16
Dependent Claim
16 words
The composition of claim 14 wherein said fiber reinforcement comprises unidirectional, collimated fibers, yarns, and tows.
Claim 17
Dependent Claim
12 words
The composition of claim 14 wherein said fiber reinforcement comprises woven cloth.
Claim 18
Dependent Claim
13 words
The composition of claim 14 wherein said fiber reinforcement comprises a non-woven mat.
Claim 19
Dependent Claim
30 words
The composition of claim 3 wherein said first layer additionally contains fiber reinforcement selected from the group consisting of carbon/graphite, silicon carbide, fiberglass, aramid, polyester, nylon, polybenzimidazole, polyethylene and polypropylene.
Claim 20
Dependent Claim
16 words
The composition of claim 18 wherein said fiber reinforcement comprises unidirectional, collimated fibers, yarns, and tows.
Claim 21
Dependent Claim
12 words
The composition of claim 18 wherein said fiber reinforcement comprises woven cloth.
Claim 22
Dependent Claim
13 words
The composition of claim 18 wherein said fiber reinforcement comprises a non-woven mat.
Claim 23
Dependent Claim
30 words
The composition of claim 4 wherein said first layer additionally contains fiber reinforcement selected from the group consisting of carbon/graphite, silicon carbide fiberglass, aramid, polyester, nylon, polybenzimidazole, polyethylene and polypropylene.
Claim 24
Dependent Claim
16 words
The composition of claim 22 wherein said fiber reinforcement comprises unidirectional, colimated fibers, yarns, and tows.
Claim 25
Dependent Claim
12 words
The composition of claim 22 wherein said fiber reinforcement comprises woven cloth.
Claim 26
Dependent Claim
13 words
The composition of claim 22 wherein said fiber reinforcement comprises a non-woven mat.
Claim 27
Dependent Claim
46 words
A multiple layer composition comprising: (a) a first layer comprising a heat-curable, cyanate-functional resin: (b) at least a second layer which is a silicone coated release film removably adherent to said cyanate-functional resin layer; wherein said silicone coating is cured by means of an electron beam.
Claim 28
Dependent Claim
46 words
A multiple layer composition comprising: (a) a first layer comprising a heat-curable, cyanate-functional resin: (b) at least a second layer which is a silicone coated release film removably adherent to said cyanate-functional resin layer; wherein said silicone coating is cured by means of an electron beam.
Claim 29
Dependent Claim
45 words
A multiple layer composition comprising: (a) a first layer comprising a heat-curable, cyanate-functional resin; (b) at least a second layer which is a silicone coated release film removably adherent to said cyanate-functional resin layer; wherein said silicone coating is cured by means of actinic radiation.
Claim 30
Dependent Claim
45 words
A multiple layer composition comprising: (a) a first layer comprising a heat-curable, cyanate-functional resin; (b) at least a second layer which is a silicone coated release film removably adherent to said cyanate-functional resin layer; wherein said silicone coating is cured by means of actinic radiation.
Claim 31
Dependent Claim
12 words
The composition of claim 27 wherein said actinic radiation is ultraviolet light.
References Cited (Backward Citations)
US3749593A
Cited
US4276352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |