US4528305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy resin modeling stock
Assignee: BASF Corp
•
Filing: 1984-04-13
•
Granted: 1985-07-09
•
Expires: 2004-04-13
Abstract
Abstract Cured epoxy resin compositions, having a glass transition temperature (Tg) over 300° F. (149° C.) coupled with coefficients of linear thermal expansion (CTE) closely approaching those of aluminum, find practical utility in tooling applications as a modeling stock. The epoxy resin composition comprises one or more epoxy resins, one or more aromatic amine hardeners or a blend of aromatic and aliphatic amine hardeners, and a combination of at least three fillers selected from the group consisting of glass fibers, glass microspheres, graphite fibers and mica.
Inventors
- 👤 Rebecca D. Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:34
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/346; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/5006; C08G59/5033; C08K7/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
184 words
A cured epoxy resin composition having a glass transition temperature (Tg) over 300° F. (149° C.) coupled with a coefficient of thermal linear expansion (CTE) of less than 1.0×10 -5 in/in/°F. (or 1.8×10 -5 cm/cm/°C.) in the 75°-105° F. (24°-41° C.) range and of less than 1.9×10 -5 in/in/°F. (or 3.4×10 -5 cm/cm/°C.) in the 100°-350° F. (38°-177° C.) range, which comprisels the cured product of (a) one or more epoxy resins, (b) one or more aromatic amine hardeners; or a mixture of said aromatic amine hardener or hardeners with up to 25% by weight of component (b) of an aliphatic amine hardener, wherein based on the total weight of components (a), (b) and (c), the % by weight of (a) plus (b) is from 80 to 50% by weight and the amount of component (b) is essentially that needed provide one amine moiety for each epoxy moiety in component (a), and (c) from 20 to 50% by weight of at least three fillers selected from the group consisting of glass fibers, glass microspheres, graphite fibers and mica in proportions roughly of 2:1:1:2, respectively.
Claim 2
Dependent Claim
184 words
A cured epoxy resin composition having a glass transition temperature (Tg) over 300° F. (149° C.) coupled with a coefficient of thermal linear expansion (CTE) of less than 1.0×10 -5 in/in/°F. (or 1.8×10 -5 cm/cm/°C.) in the 75°-105° F. (24°-41° C.) range and of less than 1.9×10 -5 in/in/°F. (or 3.4×10 -5 cm/cm/°C.) in the 100°-350° F. (38°-177° C.) range, which comprisels the cured product of (a) one or more epoxy resins, (b) one or more aromatic amine hardeners; or a mixture of said aromatic amine hardener or hardeners with up to 25% by weight of component (b) of an aliphatic amine hardener, wherein based on the total weight of components (a), (b) and (c), the % by weight of (a) plus (b) is from 80 to 50% by weight and the amount of component (b) is essentially that needed provide one amine moiety for each epoxy moiety in component (a), and (c) from 20 to 50% by weight of at least three fillers selected from the group consisting of glass fibers, glass microspheres, graphite fibers and mica in proportions roughly of 2:1:1:2, respectively.
Claim 3
Dependent Claim
45 words
A composition according to claim 1 wherein the weight of components (a) plus (b) is from 75 to 68% by weight, based on the total weight of components (a), (b) and (c), and the weight of component (c) is from 25 to 32% by weight.
Claim 4
Dependent Claim
36 words
A composition according to claim 2 wherein component (a) is from 64 to 46% by weight and component (b) is from 11 to 22% by weight of the total weight of components (a), (b) and (c).
Claim 5
Dependent Claim
16 words
A composition according to claim 1 having a Tg value of over 350° F. (177° C.).
Claim 6
Dependent Claim
29 words
A composition according to claim 1 wherein the epoxy resin of component (a) is one or more of 2,2-bis(p-glycidyloxyphenyl)propane, epoxy phenol novolac, 1,4-diglycidyloxybutane, 4-vinyl-1-cyclohexene dioxide, N,N,O-triglycidyl-p-aminophenol, N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane or 1,1,2,2-tetrakis(p-glycidyloxyphenyl)ethane.
Claim 7
Dependent Claim
26 words
A composition according to claim 5 wherein the epoxy resin of component (a) is one or more of 2,2-bis(p-glycidyloxyphenyl)propane, epoxy phenol novolac, 4-vinyl-1-cyclohexene dioxide or N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane.
Claim 8
Dependent Claim
20 words
A composition according to claim 6 wherein component (a) is a combination of epoxy phenol novolac, 4-vinyl-1-cyclohexene dioxide and N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenylmethane.
Claim 9
Dependent Claim
26 words
A composition according to claim 1 wherein the aromatic amine hardener of component (b) is one or more of 4,4'-methylenedianiline, diethyltoluenediamine, m-phenylenediamine, 2,4-bis(p-aminobenzyl)aniline or 4,4'-diaminodiphenyl sulfone.
Claim 10
Dependent Claim
23 words
A composition according to claim 8 wherein the aromatic amine hardeners of component (b) are a combination of 4,4'-methylenedianiline, diethyltoluenediamine, m-phenylenediamine and 2,4-bis(p-aminobenzyl)aniline.
Claim 11
Dependent Claim
21 words
A composition according to claim 1 wherein the aliphatic amine hardener of component (b) is triethylenetetramine, diethylenetriamine, tetraethylenepentamine, 3-diethylaminopropylamine or 3,3'-iminobispropylamine.
Claim 12
Dependent Claim
11 words
A composition according to claim 10 wherein the hardener is triethylenetetramine.
Claim 13
Dependent Claim
15 words
A composition according to claim 1 wherein the glass microspheres of component (c) are hollow.
Claim 14
Dependent Claim
14 words
A composition according to claim 1 wherein the mica of component (c) is acicular.
Claim 15
Dependent Claim
30 words
A composition according to claim 1 wherein the fillers of component (c) are a combination of graphite fibers, acicular mica and hollow glass microspheres in a roughly 1:2:1 weight ratio.
Claim 16
Dependent Claim
31 words
An uncured epoxy resin composition having the components of the composition according to claim 1 which when cured gives a Tg and CTE values of the composition according to claim 1.
References Cited (Backward Citations)
US2866768A
Cited
US3384610A
Cited
US3398211A
Cited
US3538039A
Cited
US3533985A
Cited
US3409591A
Cited
US3477990A
Cited
US3886846A
Cited
US3741928A
Cited
US3954650A
Cited
US4101459A
Cited
US4182832A
Cited
US4366108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |