Claims
- 1. A curable composition which comprises
- (a) 38 to 99.95% by weight of an unsaturated, flame-retardant, linear polyester consisting essentially in the total condensed acid component of at least 20 mol % of an unsaturated dicarboxylic acid selected from the group consisting of maleic, fumaric, itaconic, citraconic and dimethylmaleic acids and up to 80 mol % of a saturated aromatic or aliphatic dicarboxylic acid selected from the group consisting of phthalic, terephthalic, isophthalic, 2,5-dibromoterephthalic, succinic, glutaric, adipic, pimelic, suberic, azelaic and sebacic acids; and in the total condensed diol component of at least 18 mol % of a brominated or of at least 47 mol % of a chlorinated benzimidazolone diol of formula I ##STR7## wherein X independently denotes bromine or chlorine, R.sub.1 and R.sub.1 ' each denotes hydrogen, methyl, ethyl or phenyl, and R.sub.2 and R.sub.2 ' each denotes hydrogen or R.sub.1 together with R.sub.2 and R.sub.1 ' together with R.sub.2 ' each denote trimethylene or tetramethylene; the amount of diol of formula I incorporated in said polyester being that required to bring the bromine content of said polyester to at least 15 weight % or the chlorine content to at least 20 weight %; and with the remaining condensed diol component selected from the group consisting of ethylene glycol, diethylene glycol, polyethylene glycol of up to 24 carbon atoms, propylene glycol, dipropylene glycol, polypropylene glycol of up to 24 carbon atoms, 1,4-butane-diol, 1,12-dodecanediol, neopentyl glycol and 1,4-cyclohexanediol,
- (b) 0 to 60% by weight of an olefinically unsaturated polymerizable comonomer selected from the group consisting of styrene, divinylbenzene, vinyl acetate, diallyl phthalate, diglycolic acid diallyl ester, diethylene glycol-bis-allyl carbonate, diallylphenyl phosphate, triallyl cyanurate, the alkyl esters of acrylic acid, the alkyl esters of methacrylic acid, ethylene glycol dimethacrylate, acrylonitrile and methacrylonitrile, and
- (c) 0.05 to 2% by weight of a polymerization catalyst.
- 2. A composition according to claim 1, in which the polymerizable comonomer is styrene.
- 3. A composition according to claim 1 wherein the linear, unsaturated polyester of component (a) contains a benzimidazolone diol of formula I wherein X is bromine or chlorine, R.sub.1 and R.sub.1 ' each denote hydrogen or methyl, and R.sub.2 and R.sub.2 ' each denote hydrogen.
- 4. A composition according to claim 1 wherein the linear, unsaturated polyester of component (a) consists essentially in the total condensed acid component of at least 50 mol % of an unsaturated acid selected from the group consisting of maleic acid or fumaric acid, and up to 50 mol % of a saturated aromatic or aliphatic acid selected from the group consisting of phthalic acid, adipic acid, glutaric acid and sebacic acid; and in the total condensed diol component of at least 18 mol % of a brominated or of at least 47 mol % of a chlorinated benzimidazolone diol of formula I wherein X is bromine or chlorine, R.sub.1 and R.sub.2 ' each denote hydrogen or methyl, and R.sub.2 and R.sub.2 ' each denote hydrogen; and with the remaining condensed diol component selected from the group consisting of ethylene glycol and diethylene glycol.
- 5. A composition according to claim 1 which comprises in component (b) 10 to 60% by weight of a polymerizable comonomer.
- 6. A composition according to claim 1 which comprises in component (c) 0.05 to 2% by weight of a free radical polymerization catalyst.
Priority Claims (2)
Number |
Date |
Country |
Kind |
15954/73 |
Nov 1973 |
CH |
|
10736/74 |
Aug 1974 |
CH |
|
Parent Case Info
This is a divisional of application Ser. No. 521,128 filed on Nov. 5, 1974.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
2779701 |
Robitschek et al. |
Jan 1957 |
|
3697625 |
Smith et al. |
Oct 1972 |
|
3860564 |
Habermeier et al. |
Jan 1975 |
|
Non-Patent Literature Citations (1)
Entry |
B521,128, Feb. 1976, Batzer et al., 260/75 N. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
521128 |
Nov 1974 |
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