Plastisol composition and container closure gasket made therefrom
AssigneeW. R. Grace & Co.
InventorWalter R. Wszolek
Life of this patent
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Abstract
A plastisol composition containing as the resin component a copolymer of a normal .alpha.-olefin and maleic anhydride (1:1 mole ratio) having the structure ##STR1## WHEREIN B is a member of the group consisting of ##STR2## and the hydrolysis product thereof, ##STR3## R is H or C.sub.x H.sub.2+1, x is 1 to 16 and n is 2-300, and a plasticizer for said resin component. The plastisol when fluxed can be used as a closure gasket for containers.
Claims5
A plastisol composition comprising (a) a copolymer resin of a normal .alpha.-olefin and maleic anhydride (1:1 mole ratio) having a particle size in the range from about 0.1 to about 1500 microns and having the structure ##STR8## wherein B is a member of the group consisting of ##STR9## and ##STR10## R is H or C.sub.x H.sub.2x+1, x is 1 to 16 and n is 2-300, and (b) 65-600 parts/100 parts copolymer of a thiol plasticizer having the formula
- R'--(SH).sub.x
- wherein x is at least one and R' is an organic moiety.
A container closure comprising a cap having deposited therein a resinous mass functioning as a gasket to seal the container when the closure is in sealing relationship with the container, said resinous mass comprising a fluxed plastisol of a composition comprising (a) a copolymer resin of a normal .alpha.-olefin and maleic anhydride (1:1 mole ratio) having a particle size in the range from about 0.1 to about 1500 microns and having the structure ##STR11## wherein B is a member of the group consisting of ##STR12## R is H or C.sub.x H.sub.2x+1, x is 1 to 16 and n is 2-300, and (b) 65-600 parts/100 parts copolymer of a thiol plasticizer having the formula
- R'--(SH).sub.x
- wherein x is at least one and R is an organic moiety.
The process of forming a solidified, homogeneous mass which comprises admixing a plastisol composition comprising (a) a copolymer resin of a normal .alpha.-olefin and maleic anhydride (1:1 mole ratio having a particle size in the range from about 0.1 to about 1500 microns and having the structure ##STR13## wherein B is a member of the group consisting of ##STR14## R is H or C.sub.x H.sub.2x+1, x is 1 to 16 and n is 2-300, and (b) 65-600 parts/100 parts copolymer of a thiol plasticizer having the formula
- R--(SH).sub.x
- wherein x is at least one and R' is an organic moiety;
- and, thereafter, heating the admixture for a time sufficient to flux the mass.
Dependencies are inferred from the claim text.