US3903027A
Expired / Lapsed
US
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Diallyl isophthalate encapsulating compositions and process for preparing the same
Assignee: Unilever Bestfoods North America
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Filing: 1974-05-13
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Granted: 1975-09-02
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Expires: 1994-05-13
Abstract
Abstract Disclosed in the application are diallyl isophthalate encapsulating compositions, comprising: A. A THERMOSETTING DIALLYL ISOPHTHALATE PREPOLYMER CHARACTERIZED AS HAVING A VISCOSITY OF LESS THAN ABOUT 40 C.P.S. AT 25*C in a 50 percent solution of methyl ethyl ketone, said prepolymer being present in said composition in an amount ranging up to about 35 percent, by weight, B. A SUBSTANTIALLY PURE INERT FILLER, C. A FREE RADICAL POLYMERIZATION INITIATOR PRESENT IN AN AMOUNT SUFFICIENT TO PROMOTE THERMOSETTING OF SAID PREPOLYMER AT ELEVATED TEMPERATURES, AND D. A SMALL BUT EFFECTIVE AMOUNT OF A MOLD RELEASE AGENT, SAID ENCAPSULATING COMPOSITION BEING CHARACTERIZED AS HAVING A Brabender melt viscosity at 150*C in minimum torque of from about 30 to about 100 meter-grams and capable of providing, when cured, a substantially uniform Coefficient of Thermal Expansion at elevated temperatures such that the Coefficient of Thermal Expansion of the cured composition is less than about 45 X 10 6 In/In/*C. at 185*C.
Inventors
- 👤 Calvin K Johnson
- 👤 Robert F Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:53
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; C; C08; C08F; C08F263/00; C08F263/06; C08F263/08; C08L; C08L31/00; C08L31/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
158 words
A DIALLYL ISOPHTHALATE ENCAPSULATING COMPOSITION, COMPRISING: A. A THERMOSETTING DIALLYL ISOPHTHALATE PREPOLYMER CHARACTERIZED AS HAVING A VISCOSITY OF LESS THAN ABOUT 40 C.P.S. AT 25*C. IN A 50PERCENT SOLUTION OF METHYL ETHYL KETONE, SAID PREPOLYMER BEING PRESENT IN SAID COMPOSITION IN AN AMOUNT RANGING UP TO ABOUT 35 PERCENT, BY WEIGHT, B. A SUBSTANTIALLY PURE INERT FILLER SELECTED FROM THE GROUP CONSISTING OF SILICA, SILICATES, FIBER GLASS AND MIXTURES THEREOF, C. A FREE RADICAL POLYMERIZATION INITIATOR PRESENT IN AN AMOUNT SUFFICIENT TO PROMOTE THERMOSETTING OF SAID PREPOLYMER AT ELEVATED TEMPERATURES, AND D. A SMALL BUT EFFECTIVE AMOUNT OF A MOLD RELEASE AGENT, SAID ENCAPSULATING COMPOSITION BEING CHARACTERIZED AS HAVING A BRABENDER MELT VISCOSITY AT 150*C. IN MINIMUM TORQUE OF FROM ABOUT 30 TO ABOUT 100 METERGRAMS AND CAPABLE OF PROVIDING, WHEN CURED, A SUBSTANTIALLY UNIFORM COEFFICIENT OF THERMAL EXPANSION AT ELEVATED TEMPERATURES SUCH THAT ITS COEFFICIENT OF THERMAL EXPANSION IS LESS THAN ABOUT 45X 10**6 IN/IN/*C. AT 185*C.
Claim 2
Dependent Claim
158 words
A DIALLYL ISOPHTHALATE ENCAPSULATING COMPOSITION, COMPRISING: A. A THERMOSETTING DIALLYL ISOPHTHALATE PREPOLYMER CHARACTERIZED AS HAVING A VISCOSITY OF LESS THAN ABOUT 40 C.P.S. AT 25*C. IN A 50PERCENT SOLUTION OF METHYL ETHYL KETONE, SAID PREPOLYMER BEING PRESENT IN SAID COMPOSITION IN AN AMOUNT RANGING UP TO ABOUT 35 PERCENT, BY WEIGHT, B. A SUBSTANTIALLY PURE INERT FILLER SELECTED FROM THE GROUP CONSISTING OF SILICA, SILICATES, FIBER GLASS AND MIXTURES THEREOF, C. A FREE RADICAL POLYMERIZATION INITIATOR PRESENT IN AN AMOUNT SUFFICIENT TO PROMOTE THERMOSETTING OF SAID PREPOLYMER AT ELEVATED TEMPERATURES, AND D. A SMALL BUT EFFECTIVE AMOUNT OF A MOLD RELEASE AGENT, SAID ENCAPSULATING COMPOSITION BEING CHARACTERIZED AS HAVING A BRABENDER MELT VISCOSITY AT 150*C. IN MINIMUM TORQUE OF FROM ABOUT 30 TO ABOUT 100 METERGRAMS AND CAPABLE OF PROVIDING, WHEN CURED, A SUBSTANTIALLY UNIFORM COEFFICIENT OF THERMAL EXPANSION AT ELEVATED TEMPERATURES SUCH THAT ITS COEFFICIENT OF THERMAL EXPANSION IS LESS THAN ABOUT 45X 10**6 IN/IN/*C. AT 185*C.
Claim 3
Dependent Claim
65 words
removing said organic liquid from the mixture, to provide an encapsulating composition characterized as having a Brabender melt viscosity at 150*C in minimum torque of from about 30 to about 100 meter-grams and capable of providing, when cured, a substantially uniform Coefficient of Thermal Expansion at elevated temperatures such that its Coefficient of Thermal Expansion is less then 45 X 10 6 In/In/*C. at 185*C.
Claim 4
Dependent Claim
65 words
removing said organic liquid from the mixture, to provide an encapsulating composition characterized as having a Brabender melt viscosity at 150*C in minimum torque of from about 30 to about 100 meter-grams and capable of providing, when cured, a substantially uniform Coefficient of Thermal Expansion at elevated temperatures such that its Coefficient of Thermal Expansion is less then 45 X 10 6 In/In/*C. at 185*C.
Claim 5
Dependent Claim
22 words
The composition of claim 1, wherein said composition contains from about 15 percent to about 30 percent, by weight of said prepolymer.
Claim 6
Dependent Claim
22 words
The composition of claim 1, wherein said composition contains from about 20 percent to about 25 percent, by weight of said prepolymer.
Claim 7
Dependent Claim
23 words
The composition of claim 1, wherein said composition contains from about 60 percent to about 85 percent, by weight of said inert filler.
Claim 8
Dependent Claim
17 words
The composition of claim 4, wherein said inert filler is a mixture of silica and fiber glass.
Claim 9
Dependent Claim
14 words
The composition of claim 1, wherein said composition additionally contains a silane coupling agent.
Claim 10
Dependent Claim
24 words
The composition of claim 1, wherein said composition additionally contains monomeric diallyl isophthalate in an amount sufficient to reduce the viscosity of said composition.
Claim 11
Dependent Claim
31 words
The composition of claim 1, wherein said prepolymer has a viscosity of from about 10 to about 25 c.p.s. at 25*c.p.s. at 25*C in 50 percent solution of methyl ethyl ketone.
Claim 12
Dependent Claim
19 words
The composition of claim 1, wherein said composition contains up to about 50 percent, by weight of fiber glass.
Claim 13
Dependent Claim
27 words
The composition of claim 2, wherein said composition, when cured, has a Coefficient of Thermal Expansion of less than about 35 X 10 6 In/In/*C. at 185*C.
Claim 14
Dependent Claim
199 words
A diallyl isophthalate encapsulating composition, comprising: a. a thermosetting diallyl isophthalate prepolymer characterized as having a viscosity of from about 10 to about 25 c.p.s. at 25*C in a 50 percent solution of methyl ethyl ketone, said prepolymer being present in said composition in an amount ranging from about 15 percent to about 30 percent, by weight, b. a substantially pure, water insoluble inert filler selected from the group consisting of silica, silicates, fiber glass and mixtures thereof, said filler being present in an amount ranging from about 65 percent to about 85 percent, by weight, c. a free radical peroxide-type polymerization initiator present in an amount sufficient to promote thermosetting of said prepolymer at elevated temperatures, and d. a small but effective amount of a mold release agent, said molding composition being characterized as having a glass transition temperature greater than 210*C, a Brabender melt viscosity at 150*C in minimum torque of from about 30 to about 100 meter-grams, and being further characterized as being capable of providing, when cured, a substantially uniform Coefficient of Thermal Expansion at elevated temperatures such that its Coefficient of Thermal Expansion is less than about 40 X 10 6 In/In/*C. at 185*C.
Claim 15
Dependent Claim
199 words
A diallyl isophthalate encapsulating composition, comprising: a. a thermosetting diallyl isophthalate prepolymer characterized as having a viscosity of from about 10 to about 25 c.p.s. at 25*C in a 50 percent solution of methyl ethyl ketone, said prepolymer being present in said composition in an amount ranging from about 15 percent to about 30 percent, by weight, b. a substantially pure, water insoluble inert filler selected from the group consisting of silica, silicates, fiber glass and mixtures thereof, said filler being present in an amount ranging from about 65 percent to about 85 percent, by weight, c. a free radical peroxide-type polymerization initiator present in an amount sufficient to promote thermosetting of said prepolymer at elevated temperatures, and d. a small but effective amount of a mold release agent, said molding composition being characterized as having a glass transition temperature greater than 210*C, a Brabender melt viscosity at 150*C in minimum torque of from about 30 to about 100 meter-grams, and being further characterized as being capable of providing, when cured, a substantially uniform Coefficient of Thermal Expansion at elevated temperatures such that its Coefficient of Thermal Expansion is less than about 40 X 10 6 In/In/*C. at 185*C.
Claim 16
Dependent Claim
17 words
THe composition of claim 11, wherein said inert filler is a mixture of silica and fiber glass.
Claim 17
Dependent Claim
14 words
The composition of claim 11, wherein said composition additionally contains a silane coupling agent.
Claim 18
Dependent Claim
13 words
The composition of claim 11, wherein said composition additionally contains a flame retardant.
Claim 19
Dependent Claim
13 words
The composition of claim 11, wherein said mold release agent is calcium stearate.
Claim 20
Dependent Claim
10 words
A process for preparing a diallyl isophthalate encapsulating composition comprising:
Claim 21
Dependent Claim
10 words
A process for preparing a diallyl isophthalate encapsulating composition comprising:
Claim 22
Dependent Claim
16 words
The process of claim 16, wherein carbon black and other fillers are added to the mixture.
Claim 23
Dependent Claim
26 words
The process of claim 16, wherein said organic liquid is removed by heating the mixture on a hot roll mill to form a dry uniform mixture.
Claim 24
Dependent Claim
34 words
The process of claim 16, which includes the additional step of compressing the dry composition in a mold and heating the composition in the mold to cure the composition to a thermoset resin composition.
References Cited (Backward Citations)
US2275957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |