Biosourced alkyd resin and method for manufacturing such an alkyd resin

Patent metadata

Field	Value
Publication number	US-2016168318-A1
Application number	US-201414910007-A
Country	US
Kind code	A1
Filing date	Aug 5, 2014
Priority date	Aug 5, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

The present invention relates to an alkyd resin as well as to a method for preparing such a resin, said alkyd resin resulting from the polycondensation:
of at least one polyacid, preferably biosourced, or its acid anhydride preferably biosourced, of at least one component based on oil, preferably biosourced, or its corresponding fatty acid, preferably biosourced, of at least one polyol, preferably biosourced, having at least two hydroxyl groups, selected from polyols comprising at least one 1,4:3,6-dianhydrohexitol unit, of rosin or of at least one of its derivatives, wherein at least one polyacid is succinic acid, preferably biosourced, or its anhydride, preferably biosourced; and wherein the percentage by dry weight of rosin or its derivatives based on the total dry weight of succinic acid and of its anhydride and of rosin or its derivatives is comprised between about 10% and about 80%.

First claim

1 - 15 . (canceled)

16 . An alkyd resin resulting from the polycondensation:
of at least one polyacid, or its acid anhydride, of at least one component based on oil, or its corresponding fatty acid, of at least one polyol, having at least two hydroxyl groups, selected from polyols comprising at least one 1,4:3,6-dianhydrohexitol unit, of rosin or of at least one of its derivatives, wherein at least one polyacid is succinic acid, or its anhydride; and wherein the percentage by dry weight of rosin or its derivatives based on the total dry weight of succinic acid or of its anhydride and of rosin or its derivatives is comprised between about 10% and about 80%.

17 . The resin according to claim 16 , wherein said resin comprises from 10% to 30% by weight of the polyacid component.

18 . The resin according to claim 16 , wherein said resin comprises between 10% and 50% by weight of the component based on oil or on its corresponding fatty acid.

19 . The resin according to claim 18 , wherein the plant oils and their corresponding fatty acids are selected from Soya oils or fatty acids, Sunflower oils or fatty acids, Flax oils or fatty acids, Tung oils or fatty acids, Castor oils or fatty acids, Tall-Oil fatty acid or mixtures thereof.

20 . The resin according to claim 16 , wherein said resin further comprises another polyol component selected from among pentaerythritol (C 5 H 12 O 4 ), glycerol (C 3 H 8 O 3 ), sorbitol (C 6 H 14 O 6 ), erythritol (C 4 H 10 O 4 ).

21 . The resin according to claim 16 , wherein the polyol comprises at least one 1,4:3,6-dianhydrohexitol unit selected from among: 1,4:3,6-dianhydro-D-sorbitol (isosorbide), 1,4:3,6-dianhydro-D-mannitol (isomannide), 1,4:3,6-dianhydro-L-iditol (isoidide).

22 . The resin according to claim 21 , wherein said resin comprises from 20% to 30% by weight of polyol component(s).

23 . The resin according to claim 22 , wherein said resin has an acid number of less than 20 mg KOH/g.

24 . The resin according to claim 16 , wherein said resin has an oil length comprised between 10% and 50% by weight.

25 . The alkyd resin according to claim 16 , wherein the percentage by dry weight of rosin or its derivatives based on the total dry weight of succinic acid or of its anhydride and of rosin or its derivatives is comprised between about 30% and about 70%.

26 . The alkyd resin according to claim 16 , wherein the percentage by dry weight of rosin or its derivatives based on the total dry weight of succinic acid or of its anhydride and of rosin or its derivatives is comprised between about 50% and 65%.

27 . The alkyd resin according to claim 17 , wherein said resin comprises from 15% to 25% by weight of the polyacid component.

28 . The alkyd resin according to claim 18 , wherein said resin comprises between 25% and 35% by weight of the component based on oil or on its corresponding fatty acid.

29 . The alkyd resin according to claim 20 , wherein said resin further comprises another polyol component selected from among pentaerythritol and glycerol.

30 . A method for preparing an alkyd resin according to claim 16 , comprising a polycondensation step of the following components:
at least one polyacid, or its acid anhydride; at least one component based on oil, or on its corresponding fatty acid; at least one polyol, having at least two hydroxyl groups selected from polyols comprising at least one 1,4:3,6-dianhydrohexitol unit; rosin or one of its derivatives; said at least one polyacid being succinic acid, or its anhydride, and the percentage by dry weight of rosin or its derivatives based on the total dry weight of succinic acid or its anhydride and of rosin or its derivatives is comprised between about 10% and about 80%;
these components being dynamically mixed continuously at a temperature comprised between 180° C. and 280° C., until formation of the alkyd resin.

31 . The preparation method according to claim 30 , wherein the polycondensation step is carried out without any catalyst of the esterification reaction.

32 . The preparation method according to claim 30 , wherein the temperature of the reaction medium during the polycondensation step is high up to at least 180° C., a flow of chemically inert gas.

33 . The preparation method according to claim 30 , wherein the temperature of the reaction medium during the polycondensation step is maintained for at least two hours between 220° C. and 250° C. until an acid number of less than 20 mg KOH/g of the alkyd resin is attained.

34 . A paint comprising a resin according to claim 31 .

35 . The use of a resin according to claim 16 as a binder in a composition of coatings selected from coatings for adhesives, paints, wood stains, primary coats or varnishes.

Assignees

• A Et A Mader
• Roquette Freres

Inventors

• Barquant Cyril
• Roussel Joël
• Buffe Clothilde
• Crowther-Alwyn Laura

Classifications

• C08G63/48 Primary

  by unsaturated higher fatty oils or their acids; by resin acids · CPC title

• C09D167/08

  Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids · CPC title

• C08G63/672 Primary

  Dicarboxylic acids and dihydroxy compounds · CPC title