Method for improving erasability of erasable marking compositions
AssigneeRohm and Haas Company
InventorMartin Vogel
Life of this patent
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Abstract
A method is disclosed for improving the erasability of erasable marking compositions, while maintaining the opacity of the coating and without producing burnishing, by incorporating into the compositions voided latex particles having a shell polymerized from either: (1) at least about 25% by weight, based on the weight of the shell, of a crosslinking comonomer; (2) at least about 5% by weight, based on the weight of the shell, of a crosslinking comonomer, when at least about 50% by weight of methyl methacrylate is used as a comonomer in the shell. An improved liquid marking composition is also disclosed.
Claims5
An improved liquid marking composition, wherein the improvement comprises incorporating into said composition voided latex particles formed from a multistaged polymer particle having a core polymer polymerized from ethylenically unsaturated monomers and having a shell polymerized from at least about 25% by weight, based on the weight of the shell, of an ethylenically unsaturated crosslinking comonomer.
An improved liquid marking composition, wherein the improvement comprises incorporating into said composition voided latex particles formed from a multistaged polymer particle having a core polymer polymerized from ethylenically unsaturated monomers and having an outermost shell formed from methyl methacrylate and from at least about 5% by weight, based on the weight of the shell of an ethylenically unsaturated crosslinking comonomer.
Dependencies are inferred from the claim text.