Polyester resins based on fatty acids that have a short oil length, aqueous dispersions and associated coatings
First Claim
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1. An aqueous resin dispersion comprising at least one polyester resin derived from:
- at least one fatty acid, andan acid component comprising, in addition to said fatty acid, from 45% to 75%, relative to the total weight of said resin, of rosin and/or rosin derivatives bearing at least one carboxylic acid function,said acid component comprising at least one acid containing at least one carboxylic acid function and having an overall functionality of 2 to 3, selected from the group consisting of saturated polyacids, ethylenically unsaturated polyacids, and hydroxy acids, wherein said polyacid comprises at least on C36 fatty acid dimer and/or C54 fatty acid trimer;
wherein said resin has an oil length from 0% to 35%, and has a weight ratio of oxidizable fatty monoacids relative to the overall fatty acids from 0 to 1;
wherein said resin comprises less than 5% by weight aromatic compound in addition to the rosin and/or rosin derivatives bearing at least one carboxylic acid function,said aqueous resin dispersion further comprising at least one surfactant selected from the group consisting of;
anionic surfactant, nonionic surfactant, and at least one surfactant having both anionic and nonionic functional units, and with an overall surfactant weight ratio relative to said resin from 2% to 15%;
whereby said resin is dispersed in water without need for organic solvent and in the absence of groups that make the resin self-dispersing.
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Abstract
The invention relates to a polyester resin which is based on at least one fatty acid, with a zero oil length (0%) or an oil length of between 0 and 35%, with a weight ratio of oxidizable fatty acids (monoacids), relative to the overall fatty acids, of 0 or greater than 0 and ranging up to 1, and which is based on an acid component comprising, in addition to said fatty acid, from 30% to 85% by weight, relative to the total weight of said resin, of rosin and/or of derivatives thereof bearing at least one carboxylic acid function.
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Citations
17 Claims
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1. An aqueous resin dispersion comprising at least one polyester resin derived from:
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at least one fatty acid, and an acid component comprising, in addition to said fatty acid, from 45% to 75%, relative to the total weight of said resin, of rosin and/or rosin derivatives bearing at least one carboxylic acid function, said acid component comprising at least one acid containing at least one carboxylic acid function and having an overall functionality of 2 to 3, selected from the group consisting of saturated polyacids, ethylenically unsaturated polyacids, and hydroxy acids, wherein said polyacid comprises at least on C36 fatty acid dimer and/or C54 fatty acid trimer; wherein said resin has an oil length from 0% to 35%, and has a weight ratio of oxidizable fatty monoacids relative to the overall fatty acids from 0 to 1; wherein said resin comprises less than 5% by weight aromatic compound in addition to the rosin and/or rosin derivatives bearing at least one carboxylic acid function, said aqueous resin dispersion further comprising at least one surfactant selected from the group consisting of;
anionic surfactant, nonionic surfactant, and at least one surfactant having both anionic and nonionic functional units, and with an overall surfactant weight ratio relative to said resin from 2% to 15%;whereby said resin is dispersed in water without need for organic solvent and in the absence of groups that make the resin self-dispersing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification