US 11,535,769 B1Granted

Solvent free vinyl plastisol composition

AssigneeHenkel AG & Co. KGaA

InventorsDavid Sturgill, Corina Bisog, Joshua Harju

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Abstract

Disclosed is a heat curable solvent free plastisol composition that exhibits very low volatile organic compound amounts while maintaining high performance characteristics. The present plastisol compositions have solvent substitutes used at amounts up to 15% by weight based on the total composition weight. The solvent substitutes have very low vapor pressures, stable viscosity effects, and are fusible with the plastisol polymers. These solvent substitutes can be used to replace the typical solvents without requiring extensive re-formulation of the plastisol composition. The final plastisol compositions according to the present invention exhibit low VOC measures of less than 0.03 pounds per gallon when measured according to EPA Method 24.

Claims20

Dependent claims

A heat curable, sprayable plastisol composition having a low VOC content, consisting of:

a plurality of polymers, wherein all polymers in said plastisol composition are selected from the group consisting of liquid polymeric adipate solvent substitutes, plasticizers, polyvinyl chloride polyvinyl acetate copolymers of vinyl chloride and vinyl acetate, and optionally, plastic balloons;
wherein said one or more liquid polymeric adipate solvent substitutes have a vapor pressure at 20° C. of less than or equal to 0.0001 mm of Hg, each having a formula of R1—COO—(CH2)4—COO—R2 wherein R1 and R2 independently include one or more of an ether function, an ester function, a hydrocarbon, or a mixture thereof, and wherein said one or more liquid polymeric adipate solvent substitutes each have a molecular weight of from 300 to 1000, and said one or more liquid polymeric adipate solvent substitutes are present in a non-zero amount of up to 15% by weight based on the total weight of the plastisol composition;
said plasticizers are plasticizers selected from the group consisting of di-R phthalate plasticizers wherein R are linear or branched C6 to C11 hydrocarbon chains, di-octyl terephthalate, and mixtures thereof, and said plasticizers are present in a total amount of from 25 to 40 percent by weight based on the total weight of the plastisol composition;
said polyvinyl chloride polyvinyl acetate copolymers contain units derived from vinyl acetate in a non-zero amount of up to 15% by weight based on the weight of the polyvinyl chloride polyvinyl acetate copolymers, and said polyvinyl chloride polyvinyl acetate copolymers are present in an amount of 15 to 40% by weight based on the total weight of the sprayable plastisol composition;
wherein said plastisol composition optionally further consists of one or more fillers, colorants, adhesion promotors selected from the group consisting of polyamides, epoxy compounds, urethanes, anhydrides, silanes, and mixtures thereof, fungicides, anti-oxidants, and/or silica, and said plastisol composition has a VOC content according to EPA Method 24 of less than 0.03 pounds per gallon.

2 more elements

A sprayable, heat curable plastisol composition, consisting of:

a) 30 to 40 wt. % of one or more plasticizers selected from di-octyl terephthalate, diisononylphthalate and combinations thereof, based on the total weight of the sprayable plastisol composition;
b) 25 to 35 wt. %, based on the total weight of the sprayable plastisol composition, of one or more vinyl chloride-vinyl acetate copolymers containing vinyl acetate in an amount of up to 15 wt. % based on the total weight of the co-polymer;
c) one or more adhesion promoters selected from the group consisting of polyamides, epoxy compounds, urethanes, anhydrides and silanes;
the one or more adhesion promoters being present in a total amount of 0.5 to 6 wt. %, based on total weight of the sprayable plastisol composition;
d) 25 to 35 wt. % of one or more fillers selected from glass spheres, plastic balloons, mineral fillers, and combinations thereof, based on total weight of the sprayable plastisol composition;
wherein said mineral fillers are present in an amount of 12 to 22 wt. % based on the total weight of the plastisol composition, and are precipitated calcium carbonates coated with fatty acids selected from the group consisting of stearic acid, oleic acid, palmitic acid and combinations thereof;
e) 0.5 to 8 wt. % of one or more liquid adipate ester solvent substitutes, each having a vapor pressure of less than or equal to 0.0001 mm Hg at 20° C.;
and corresponding to the formula R1—COO—(CH2)4—COO—R2 wherein R1 and R2 independently include one or more of an ether function, an ester function, a hydrocarbon, or a mixture thereof and wherein said solvent substitutes each have a molecular weight of from 300 to 1000;
and
f) optionally, fungicides, silica, anti-oxidants, moisture scavengers, and/or pigments;
wherein said sprayable plastisol composition has VOC amounts according to EPA Method 24 of less than 0.03 pounds/gallon and is free of aliphatic, alicyclic and aromatic C7 to C12 hydrocarbons.

8 more elements

Dependencies are inferred from the claim text.