US4077939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moulding compositions including an unsaturated polyester
Assignee: Societa Italiana Resine SpA SIR
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Filing: 1976-10-22
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Granted: 1978-03-07
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Expires: 1996-10-22
Abstract
Abstract Molding composition comprising from 10 to 50 wt.% of the polycondensation product of an alkylene glycol or a mixture of the latter with up to 20 wt.% of 2,2'-bis(4-hydroxycyclohexyl)propane or a halogenated derivative thereof, with an ethylenically unsaturated dicarboxylic acid and a saturated dicaboxylic acid, having a melting point of at least 60° C, an acid value of less than 50 and a Gardner viscosity from Y to Z 3 , from 0.2 to 2 wt.% of organic peroxide with a decomposition temperature above 70° C, and an inert filler. The resulting molded articles are particularly useful in the electrical and electronic fields.
Inventors
- 👤 Piero Paparatto
- 👤 Silvio Vargiu
- 👤 Antonio Parodi
- 👤 Beppino Passalenti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:53
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/682; C08G63/6824; C08G63/6828; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G63/553; C08K; C08K3/00; C08K3/01; C08K3/013
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
124 words
A granular molding composition suitable for injection molding comprising: (a) from 10 to 50% by weight of an unsaturated polyester consisting of the polycondensation product of a polyol substance selected from the group consisting of alkylene glycols and mixtures of the latter with up to 20 wt.% of 2,2'-bis(4-hydroxycyclohexyl)propane in its unsubstituted or halogenated form, with an ethylenically unsaturated dicarboxylic acid and a saturated dicarboxylic acid, said polycondensation product having the following characteristics: melting point (at the capillary) ≧60° C acid value (mg.KOH/g) <50 Gardner viscosity (at 25° C in 60 wt.% solution in styrene) from U to Z 2 ; (b) from 0.2 to 2 wt.% of an organic peroxide having a decomposition temperature above 70° C; (c) one or more inert fillers.
Claim 2
Dependent Claim
124 words
A granular molding composition suitable for injection molding comprising: (a) from 10 to 50% by weight of an unsaturated polyester consisting of the polycondensation product of a polyol substance selected from the group consisting of alkylene glycols and mixtures of the latter with up to 20 wt.% of 2,2'-bis(4-hydroxycyclohexyl)propane in its unsubstituted or halogenated form, with an ethylenically unsaturated dicarboxylic acid and a saturated dicarboxylic acid, said polycondensation product having the following characteristics: melting point (at the capillary) ≧60° C acid value (mg.KOH/g) <50 Gardner viscosity (at 25° C in 60 wt.% solution in styrene) from U to Z 2 ; (b) from 0.2 to 2 wt.% of an organic peroxide having a decomposition temperature above 70° C; (c) one or more inert fillers.
Claim 3
Dependent Claim
25 words
The molding composition of claim 1, which comprises from 20 to 35 wt.% of unsaturated polyester and from 0.5 to 1.8 wt.% of organic peroxide.
Claim 4
Dependent Claim
23 words
The molding composition of claim 1, in which said unsaturated dicarboxylic acid is selected from the group consisting of maleic and fumaric acids.
Claim 5
Dependent Claim
24 words
The molding composition of claim 1, in which said saturated dicarboxylic acid is selected from the group consisting of phthalic, isophthalic and terephthalic acids.
Claim 6
Dependent Claim
14 words
The molding composition of claim 1, in which said alkylene glycol is ethylene glycol.
Claim 7
Dependent Claim
14 words
The molding composition of claim 1, in which said alkylene glycol is propylene glycol.
Claim 8
Dependent Claim
26 words
The molding composition of claim 1, in which the molar ratio between said unsaturated dicarboxylic acid and said saturated dicarboxylic acid is from 1:1 to 3:1.
Claim 9
Dependent Claim
34 words
The molding composition of claim 1, in which said polycondensation product has the following characteristics: melting point from 60° to 80° C; acid value from 15 to 25; Gardner viscosity from W to Y.
Claim 10
Dependent Claim
18 words
The molding composition of claim 1, in which said organic peroxide has a decomposition temperature above 120° C.
Claim 11
Dependent Claim
31 words
The molding composition of claim 1, in which said organic peroxide is selected from the group consisting of dialkyl peroxides, diaralkyl peroxides, cyclic peroxides, peroxyesters and peroxides of the ketal type.
Claim 12
Dependent Claim
29 words
The molding composition of claim 1, in which said organic peroxide is selected from the group consisting of di-tert-butyl peroxide, dicumyl peroxide, dibenzylidene diperoxide, tert-butyl peroxybenzoate and di-tert-butyl perphthalate.
Claim 13
Dependent Claim
25 words
The molding composition of claim 1, in which said inert filler is selected from the group consisting of silica, calcium carbonate, asbestos and glass fibre.
Claim 14
Dependent Claim
20 words
The molding composition of claim 1, which comprises from 10 to 55% by weight of glass fibre as inert filler.
Claim 15
Dependent Claim
45 words
The molding composition of claim 1, which comprises from 20 to 500 ppm with respect to the unsaturated polyester, of a polymerization inhibitor selected from the group consisting of quaternary ammonium salts, salts of amines, salts of copper, nitrophenols, dihydric phenols and their alkyl derivatives.
Claim 16
Dependent Claim
33 words
The molding composition of claim 1, which comprises from 1 to 3% by weight of a lubricant selected from the group consisting of waxes, stearic acid and stearates of zinc, calcium and magnesium.
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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |