Silane functionalized rosins
Disclosed are silane functionalized rosins having multiple functionalities. Such silane functionalized rosins are curable and thus capable of providing unexpected properties for various uses and end products. Also disclosed are synthetic routes to prepare silane functionalized rosins, which are formulated with hydroxyl functional polymers to provide curable adhesive compositions. The adhesives may be used for woodworking, automotive, textile, appliances, electronics, bookbinding, and packaging. Suitable substrates can be metal, polymer film, plastics, wood, glass, ceramic, paper, and concrete.
1 . A silane functionalized rosin composition which comprises a compound of Formula 1:
wherein X is:
(i) a heteroatom, or
(ii) either C(O)O or C(O)NH;
Z is a linear carbon chain having the formula (CH 2 ) n , a branched hydrocarbon, a hydroxyl group-substituted hydrocarbon, a divalent ether moiety of the formula (CH 2 ) n —O—(CH 2 ) n , or a cycloaliphatic hydrocarbon group; each n is an integer of 2 to 4;
each R is independent selected from the group consisting of alkoxy, OH, H, or alkyl, and wherein at least one of R is alkoxy or OH on each Si atom;
p is an integer of from 1 to 8;
the silane functionalized rosin is produced by reaction of a carboxyl functionalized rosin and a functional silane, the carboxyl functionalized rosin is a cycloaddition adduct produced by reaction of: (A) a rosin ester, and (B) an ethylenically unsaturated dicarboxylic acid, or anhydride, to thereby form an intermediate, and then reaction of the intermediate with a silane-containing carboxyl-reactive group, and the rosin ester comprises one or more of rosin triethylene glycol ester, rosin glycerol ester, and rosin pentaerythritol ester.
2 . The silane functionalized rosin composition of claim 1 , wherein the cycloaddition adduct is produced by reaction of the rosin acid residue, and wherein the rosin acid residue comprises abietic acid, levopimaric acid, or a combination thereof.
3 . The silane functionalized rosin composition of claim 1 , wherein the ethylenically unsaturated dicarboxylic acid or anhydride comprises one or more of fumaric acid, maleic acid, maleic anhydride, dimethyl fumarate, and dimethyl maleate.
4 . The silane functionalized rosin composition of claim 1 , wherein the functional silane is selected from:
a) one or more of 3-glycidoxypropyltriethoxysilane, aminomethyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminoisobutyltrimethoxysilane, 2-hydroxyethyltrimethoxysilane, and 2-(3,4-epoxycyclohexyl)ethyl-trimethoxysilane, or
b) an alkoxysilane compound comprising one or more glycidyl, epoxy, amino, or hydroxyl functionalities.
5 . The silane functionalized rosin composition of claim 1 , comprising:
about 4 to about 70 weight percent of the silane functionalized rosin,
about 10 to about 90 weight percent of at least one polymer,
about 0 to about 70 weight percent of at least one thermoplastic tackifying resin,
about 0 to about 50 weight percent of at least one wax,
about 0 to about 60 weight percent of at least one oil or plasticizer,
about 0.5 to about 3 weight percent of at least one stabilizer, and
about 0 to about 70 weight percent of at least one filler.
6 . A vulcanized composition, wherein the composition is obtained by vulcanizing the composition of claim 4 .
7 . The silane functionalized rosin composition of claim 1 , which comprises:
(A) from about 10% to about 60% based on the weight of the composition of at least one isocyanate;
(B) about 10% to about 60% based on the weight of the composition of the silane functionalized rosin;
(C) about 10% to about 80% based on the weight of the composition of at least one polyester or polyether polyol or a mixture thereof;
(D) from 0% to about 10% based on the weight of the composition of a blowing agent;
(E) from 0% to about 5% based on the weight of the composition of a surfactant; and
(F) from about 0.02% to about 5.0% based on the weight of the composition of a urethane catalyst.
8 . The silane functionalized rosin composition of claim 1 , further comprising:
an hydroxyl functional polymer having a hydroxyl number of 10 mgKOH/g to 200 mgKOH/g and a number average molecular weight of 500 g/mol to 10,000 g/mole, and
wherein the silane functionalized rosin forms an Si—O—C covalent bond with the hydroxyl functional polymer upon curing.
9 . The silane functionalized rosin composition of claim 8 , wherein the composition has a peel strength of 5 N/25 mm or greater, as measured in accordance with ASTM D1876 (T-peel test) or ISO 4587, or
wherein the composition has a lap shear strength of 1 N/mm2 or greater as measured in accordance with ASTM D1002, after having been fully cured between two substrates.
10 . The silane functionalized rosin composition of claim 8 , wherein the hydroxyl functional polymer is present in an amount of between 30 and 90 weight %, and wherein the silane functionalized rosin is present in an amount of between 10 and 70 weight %, based on the total weight of the composition.
11 . The silane functionalized rosin composition of claim 8 , wherein the hydroxyl functional polymer is one or more of polyester polyol, polyether polyol, and acrylic polyol.
12 . The silane functionalized rosin composition of claim 8 , further comprising an organic solvent.
13 . A vulcanized composition, obtained by vulcanizing the composition of claim 8 .