US3898192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibition of diallylic phthalate polymer compositions
Assignee: FMC Corp
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Filing: 1974-10-31
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Granted: 1975-08-05
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Expires: 1994-10-31
Abstract
Abstract Diallylic phthalate prepolymer compositions whose polymerization is controlled by addition thereto of very small proportions of phenothiazine as an inhibitor. The compositions are particularly suitable for the formulation of encapsulation molding compounds.
Inventors
- 👤 Carl Leonard Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:20
CPC Classifications
C; C09; C09K; C09K15/00; C09K15/04; C09K15/30; C08; C08F; C08F118/00; C08F118/14; C08F118/16; C08F118/18; C08K; C08K5/00; C08K5/36; C08K5/45; C08K5/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A THEMOSETTING DIALLYLIC PHTHALATE PREPOLYMER COMPOSITION COMPRISING (A) A DIALLYLIC PHTHALATE PREPOLYMER SELECTED FROM THE GROUP CONSISTING OF DIALLY ISOPHTHALATE AND DIALLYL ORTHOPHALATE PREPOLYMERS, (B) FROM ABOUT 0.001 TO 0.1% BY WEIGHT PHENOTHIAZINE BASED ON THE WEIGHT OF POLYMER, AND (C) A PEROXIDE CATALYST IN SUFFICIENT AMOUNT TO CONVERT THE DIALLYLIC PHTHALATE PREPOLYMER TO THE THERMOSET STATE AT ELEVATED TEMPERATURES AND (D) AN INERT INORGANIC FILLER IN AN AMOUNT OF 15 TO ABOUT 300 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE POLYMER.
Claim 2
Dependent Claim
85 words
A THEMOSETTING DIALLYLIC PHTHALATE PREPOLYMER COMPOSITION COMPRISING (A) A DIALLYLIC PHTHALATE PREPOLYMER SELECTED FROM THE GROUP CONSISTING OF DIALLY ISOPHTHALATE AND DIALLYL ORTHOPHALATE PREPOLYMERS, (B) FROM ABOUT 0.001 TO 0.1% BY WEIGHT PHENOTHIAZINE BASED ON THE WEIGHT OF POLYMER, AND (C) A PEROXIDE CATALYST IN SUFFICIENT AMOUNT TO CONVERT THE DIALLYLIC PHTHALATE PREPOLYMER TO THE THERMOSET STATE AT ELEVATED TEMPERATURES AND (D) AN INERT INORGANIC FILLER IN AN AMOUNT OF 15 TO ABOUT 300 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT OF THE POLYMER.
Claim 3
Dependent Claim
30 words
The thermosetting composition of claim 1 further comprising inert fibrous material in an amount of 15 to about 200 parts by weight per 100 parts by weight of the prepolymer.
Claim 4
Dependent Claim
86 words
A molding composition suitable for low pressure, transfer mold encapsulation which comprises (a) 20 to 100 parts by weight of a diallylic prepolymer selected from the group consisting of diallyl isophthalate and diallyl orthophthalate, (b) 15-80 parts by weight of an inert inorganic filler, (c) 15-70 parts of an inert fibrous filler, (d) 0.001 to 0.1% by weight phenothiazine based on the weight of the prepolymer, and (e) a peroxide catalyst in sufficient amount to convert the polymerizable materials to the thermoset state at elevated temperatures.
Claim 5
Dependent Claim
86 words
A molding composition suitable for low pressure, transfer mold encapsulation which comprises (a) 20 to 100 parts by weight of a diallylic prepolymer selected from the group consisting of diallyl isophthalate and diallyl orthophthalate, (b) 15-80 parts by weight of an inert inorganic filler, (c) 15-70 parts of an inert fibrous filler, (d) 0.001 to 0.1% by weight phenothiazine based on the weight of the prepolymer, and (e) a peroxide catalyst in sufficient amount to convert the polymerizable materials to the thermoset state at elevated temperatures.
Claim 6
Dependent Claim
23 words
The composition of claim 3 in which there is present about 15 to 60 parts of inert glass fibers as said (c) ingredient.
Claim 7
Dependent Claim
45 words
The composition of claim 3 in which there is present about 15 to 80 parts of an inert inorganic filler selected from the group consisting of silica, ground glass, clay, calcium silicate, magnesium silicate, quartz, alumina, alumina trihydrate and antimony oxide as said (b) ingredient.
Claim 8
Dependent Claim
11 words
The composition of claim 3 further comprising a mold release agent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |