Unsaturated polyester resin compositions
AssigneeAshland Inc.
InventorsKarri Airola, Outi Färm, Paul Mahbub, Eija Valtonen
Life of this patent
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Abstract
The invention relates to unsaturated polyester resins and more particularly polyester resin compositions curable at room temperature and comprising divinyl ethers. Unsaturated polyester resin compositions in accordance with the invention comprise 50-90 wt. % of at least one normal and/or one modified unsaturated polyester, not more than 30 wt. % of styrene, not more than 20 wt. % of at least one monofunctional and/or one multifunctional monomer, and 0.1-40 wt. % of at least one divinyl ether.
Claims13
A room temperature radical curable unsaturated polyester resin composition, which comprises:
- 50-90 wt % of at least one normal unsaturated polyester and/or modified unsaturated polyester produced by allowing maleic acid, fumaric acid, maleic anhydride or derivatives or mixtures thereof, and methacrylic acid or acrylic acid in an amount of not more than 40 mol %, calculated from the amount of all the components for replacing maleic acid, fumaric acid, maleic anhydride or derivatives or mixtures thereof, to react with an alcohol/alcohols selected from 2-ethyl hexanol, benzyl alcohol, 2-phenylethyl alcohol, ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, 1,4-butane diol, 2-methyl-1,3-propane diol, neopentyl glycol, 2-butyl-2-ethyl-1,3-propane diol, 1,6-hexane diol, trimethylol propane and trimethylol ethane, and at most 80% of the alcohols may be replaced by glycidyl methacrylate and/or glycidyl acrylate;
- 0.1-40 wt% of at least one divinyl ether selected from diethylene glycol divinyl ether, triethylene glycol divinyl ether, 1,4-cylcohexane dimethylol divinyl ether, dipropylene glycol divinyl ether, tripropylene glycol divinyl ether, 1,6-hexanediol divinyl ether and 1,4-butanediol divinyl ether;
- not more than 30 wt % styrene;
- not more than 20 wt % of at least one monofunctional and/or multifunctional monomer;
- and
- optionally additives.
A method for the manufacture of an unsaturated polyester resin composition, characterized in that the composition is formed by compounding
- 50-90 wt-% of at least one normal unsaturated polyester and/or modified unsaturated polyester prepared by cooking until an acid value of 5-65 is reached, and removing excess water during the reaction, from
- maleic acid, fumaric acid, maleic anhydride or a derivative or mixtures thereof, and methacrylic acid or acrylic acid may be used in an amount of not more than 40 mol-% calculated from the amount of all components, for replacing maleic acid, fumaric acid, maleic anhydride or derivatives or mixtures thereof;
- and/or
- other acids selected from benzoic acid, phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, terephthalic anhydride, adipic acid, 1,2-cyclohexyl dicarboxylic acid and 1,4-cyclohexyl dicarboxylic acid;
- and
- alcohols selected from 2-ethyl hexanol, benzyl alcohol, 2-phenylethyl alcohol, ethylene glycol, diethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, dipropylene glycol, 1,4-butane diol, 2-methyl-1,3-propane diol, neopentyl glycol, 2-butyl-2-ethyl-1,3-propane diol, 1,6-hexane diol, trimethylol propane and trimethylol ethane, and at most 80 mol-% of the alcohols may be replaced by glycidyl methacrylate and/or glycidyl acrylate;
- 0.1-40 wt-% of at least one divinyl ether selected from diethylene glycol divinyl ether, triethylene glycol divinyl ether, 1,4-cyclohexane dimethylol divinyl ether, dipropylene glycol divinyl ether, tripropylene glycol divinyl ether, 1,6-hexanediol divinyl ether and 1,4-butanediol divinyl ether;
- not more than 30 wt-% of styrene;
- not more than 20 wt-% by weight of at least one monofunctional and/or multifunctional monomer;
- and
- optionally additives.
A gelcoat composition, characterized in that it comprises 10-90 wt-% of at least one unsaturated polyester resin composition according to claim 1 or manufactured according to claim 8, 0.1-0.5 wt-% of a metal promoter, 0.1-0.5 wt-% of an amine promoter, not more than 10 wt-% of a copromoter, 0.5-3 wt-% of a peroxide catalyst and other additives selected from a group consisting of pigments, fillers, thixotropy agents, thixotropy enhancers, suppressants, air release agents, surface tension agents, wetting agents and levelling agents.
Dependencies are inferred from the claim text.