Plastisols containing glycerol esters as plasticizers
View Patent ↗Plastisols and organosols are provided that include plasticizers that include mono-, di- and triesters of glycerol. The plasticizers are good solvators for polyvinyl chloride and impart low plastisol and organosol viscosities.
1. A polymer composition comprising:
a) a thermoplastic polymer selected from the group consisting of homopolymers and copolymers of vinyl chloride, and homopolymers and copolymers of acrylic; and
b) an amount of plasticizer effective for plasticizing the thermoplastic polymer, the plasticizer including least one ester selected from the group consisting of mono-, di- and triesters of glycerol corresponding to the general formula
wherein 0 to 2 X groups are hydroxyl and 1 to 3 X groups are
wherein R 1 is —(CH 2 ) n —CH 3 , where n is 0 to 5,
wherein all R 1 groups are identical,
and wherein if n is 0, then 1 to 2 X groups are hydroxyl.
2. The polymer composition according to claim 1 wherein R 1 includes from 3 to 6 carbon atoms.
3. The polymer composition according to claim 1 wherein the polymer composition includes from about 1 to about 70 parts by weight glycerol ester per 100 parts thermoplastic polymer.
4. The polymer composition according to claim 1 wherein the composition has a ratio of glycerol to carboxylic acid of about 1 to 2.5 to about 1 to 3.0.
5. The polymer composition according to claim 1 wherein the plasticizer is glycerol tributyrate.
6. The polymer composition according to claim 1 wherein said composition contains at least one additional plasticizer selected from the group consisting of a) the reaction products of monofunctional alcohols with monofuctional acids aliphatic of aromatic monocarboxylic acids; b) the reaction of glycols or diols with monofunctional acids such as benzoic acid, and c) the reaction of at least one carboxylic acid selected from the group consisting of alkyl and aromatic dicarboxylic acids with at least one alcohol selected from the group consisting of monofunctional and polyfunctional alcohols and monomeric and oligomeric glycols.
7. The polymer composition of claim 1 wherein said composition contains at least one additional plasticizer selected from the group consisting of phthalates, terephthalates, citrates, sulphonamides, alkyl sulfonic acid esters, adipates, saturated low molecular weight polyesters, isobutyrates, and glutarates.
8. The polymer composition of claim 1 wherein the glycerol ester is a blend of from 1 to 70 parts by weight per 100 parts of said thermoplastic polymer of a first ester and from about 30 to about 100 parts by weight per 100 parts of said thermoplastic polymer of a second ester.