Alkyd resins
AssigneeHoechst Aktiengesellschaft
InventorsJurgen Ritz, Rolf Zimmermann, Hannes Fischer
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Abstract
An air-drying alkyd resin comprising (I) at least one .alpha.,.beta.-olefinically unsaturated dicarboxylic acid unit or a mixture thereof with (I') a polycarboxylic acid unit being free from polymerizable olefinic and acetylenic bonds, said units bound as an ester, (II) at least one trihydric alcohol unit or a combination thereof with a minor amount of a dihydric alcohol unit, (III) from 10 to 35% by weight (referred to the total alkyd resin) of cyclopentadiene units and (IV) at least one predominantly aliphatic monocarboxylic acid unit, wherein the amount by weight of monocarboxylic acid units is at least as large as the total amount of polycarboxylic acid units, the latter being calculated as anhydride and a process of preparation said resin.
Claims11
A multi-stage process for the preparation of a fatty acid modified alkyd resin which is capable of air-drying in the absence of a peroxide which comprises first forming a reaction product by reacting in a first step A only
- (I) at least one .alpha.,.beta.-olefinically unsaturated dicarboxylic acid component or a mixture thereof with
- (I') a polycarboxylic acid component being free from polymerisable olefinic and acetylenic bonds, the mol percent of (I) being up to 50% of (I) + (I'),
- (ii) at least one trihydric alcohol or a mixture thereof with a minor amount of a dihydric alcohol and
- (III) dicyclopentadiene at a temperature up to 160.degree. C and subsequently in a second step B adding to the product formed in A
- (iv) at least one aliphatic monocarboxylic acid component selected from the group consisting of an unsaturated fatty acid and its esters, and further esterifying and modifying A with (IV) at a temperature of at least 160.degree. C to yield an alkyd resin containing from (1) 10 to 35% by weight of cyclopentadiene units and wherein (2) the amount by weight of the aliphatic monocarboxylic acid components added is between 20 and 60% by weight of the total reaction mixture, but at least as large as the total amount of the polycarboxylic acid component, the latter being calculated as anhyride.
A monocarboxylic acid modified alkyd resin which is capable of air-drying in the absence of a peroxide formed in an at least two step process comprising forming a reaction product in a first step A by reacting only
- (I) at least one .alpha.,.beta.-olefinically unsaturated dicarboxylic acid component or a mixture thereof with (I') a polycarboxylic acid component being free from polymerisable olefinic and acetylenic bonds, the mol percent of (I) being up to 50% of (I) + (I'),
- (ii) at least one trihydric alcohol or a mixture thereof with a minor amount of a dihydric alcohol and
- (III) dicyclopentadiene at a temperature up to 160.degree. C and subsequently in a second step B adding to the product formed in A
- (iv) at least one aliphatic monocarboxylic acid component selected from the group consisting of an unsaturated fatty acid and its esters, and further esterifying and modifying A with (IV) at a temperature of at least 160.degree. C to yield an alkyd resin containing from (1) 10 to 35% by weight of cyclopentadiene units and wherein (2) the amount by weight of the aliphatic monocarboxylic acid component added is between 20 and 60% by weight of the total reaction mixture, but at least as large as the total amount of the polycarboxylic acid component, the latter being calculated as anhydride.
Dependencies are inferred from the claim text.