Alkyd resin

Claim 2

In an alkyd resin which comprises the condensation product of a polybasic acid and a polyhydric alcohol, the improvement whereby part at least of the polybasic acid is the reaction product of an olefinically unsaturated hydrocarbon resin with an alpha, beta-olefinically unsaturated monobasic acid, dibasic acid, or derivative thereof selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, citraconic acid, itaconic acid anhydride, citraconic acid anhydride, mesaconic acid and the lower alkyl esters of these acids.

Claim 3

The alkyd resin as claimed in claim 1 in which the condensation product also comprises a monobasic acid.

Claim 4

An alkyd resin as claimed in claim 1 in which the condensation product comprises an ester of a monobasic acid.

Claim 5

An alkyd resin as claimed in claim 1 in which the hydrocarbon resin is produced by the polymerization of a pyrolysis gasoline using a Friedel Crafts catalyst.

Claim 6

An alkyd resin as claimed in claim 4 in which C 4 alkenes or di-isobutene is added to the pyrolysis gasoline prior to the polymerisation to the resin.

Claim 7

An alkyd resin as claimed in claim 1 which contains in addition to the resin/unsaturated acid or derivative adduct an additional polybasic acid selected from the group consisting of ortho-, iso- and tere-phthalic acid, an aliphatic dibasic acid containing up to 20 carbon atoms, trimellitic acid and pyromellitic acid.

Claim 8

An alkyd resin as claimed in claim 1 which is derived from a. a polyhydric alcohol selected from the group consisting of mono-, di- and tri-ethylene glycol, mono-, di- and tri-propylene glycol, mono-, di- and tri-butylene glycol, polyethylene glycol, polypropylene glycol, polybutylene glycol, neopentyl glycol, glycerol, trimethylol propane, trimethylol ethane, pentaerythritol, dipentaerythritol and sorbitol, b. a monobasic acid or ester selected from the group consisting of tall oil acids, linseed oil, soyabean oil, soya oil, whale oil, dehydrated castor oil, tung oil, fish oil, safflower oil, oiticica oil, cotton seed oil, coconut oil, and aliphatic monobasic acids containing 6 to 22 carbon atoms, and c. the reaction product of an olefinically unsaturated hydrocarbon resin derived from pyrolysis gasoline with an alpha,beta-olefinically unsaturated monobasic acid, dibasic acid or derivative thereof selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, citraconic acid, mesaconic acid and the lower alkyl esters of these acids.

Claim 9

An alkyd resin as claimed in claim 7 which also includes an additional polybasic acid selected from the group consisting of ortho-, iso- and terephthalic acid, an aliphatic dibasic acid containing up to 20 carbon atoms, trimellitic acid and pyromellitic acid.

Claim 10

A process for the preparation of an alkyd resin as claimed in claim 2 in which the monobasic acid or monobasic acid ester is first reacted with the polyhydric alcohol and the intermediate product so formed is then further reacted with the resin/unsaturated acid or derivative adduct (including any additional polybasic acid).