Powder-resistant acrylic polymer floor finishes

Claim 2

AN AQUEOUS EMULSION FLOOR FINISH CONTAINING AS THE PRINCIPAL FILM FORMING POLYMER A ZINC CROSSLINKED ACRYLIC POLYMER HAVING A KNOOP HARDNESS NUMBER (KHN) OF ABOUT 14 TO 18, SAID PRINCIPAL POLYMER BEING SUITABLE FOR USE IN A FLOOR FINISH AND HAVING BEEN PREPARED BY THE EMULSION POLYMERIZATION OF A MIXTURE OF MONOMERS SELECTED FROM THE GROUP CONSISTING OF LOWER ALKYL ESTERS OF ACRYLIC ACID, METHACRYLIC ACID, OR MIXTURES THEREOF, OR AT LEAST ONE OF SAID ESTERS TOGETHER WITH A MINOR PROPORTION OF ACRYLIC ACID, METHACRYLIC ACID OR MIXTURES THEREOF, SAID FLOOR FINISH HAVING OINCOPORATED THEREIN IN COMBINATION WITH SAID PRINCIPAL POLYMER THE FOLLOWING MODIFYING POLYMERS: A. FROM 1 TO 10 PARTS BY WEIGHT PER 100 PARTS OF SAID PRINCIPAL POLYMER OF A HARD ACRYLIC POLYMER HAVING A KHN OF 19 TO 25, SAID HARD ACRYLIC POLYMER HAVING BEEN PREPARED BY EMULSION POLYMERIZATION OF AT LEAST ONE LOWER ALKYL ESTER OF METHYACRYLIC ACID; AND B. FROM 1 TO 10 PARTS BY WEIGHT PER 100 PARTS OF SAID PRINCIPAL POLYMER OF A SOFT ACRYLIC POLYMER HAVING A KHN OF NOT OVER 5.0, SAID SOFT ACRYLIC POLYMER HAVING BEEN PREPARED BY EMULSION POLYMERIZATION OF ACRYLIC MONOMERS SELECTED FROM (I) AT LEAST ONE LOWER ALKYL ESTER OF ACRYLIC ACID AND (II) A MIXTURE OF (I) WITH AT LEAST ONE MONOMER SELECTED FROM METHARCYLIC ACID; ACRYLIC ACID, AND LOWER ALKYL ESTERS OF METHACRYLIC ACID; SAID HARD POLYMER BEING PRESENT IN RELATIVE PROPORTIONS BY WEIGHT OF FROM 0.5 TO 2 PARTS PER EACH PART OF SAID SOFT POLYMER.

Claim 3

The floor finish of claim 1 in which said hard polymer has a KHN of 20 to 24 and said soft polymer has a KHN of 0.5 to 2.

Claim 4

The floor finish of claim 1 wherein said hard polymer and said soft polymer each employed in amounts of from 3 to 7 parts by weight per 100 parts of said principal polymer.

Claim 5

The floor finish of claim 3 in which said hard polymer is present in relative proportions by weight of from 0.8 to 1.25 parts per each part of said soft polymer.

Claim 6

The floor finish of claim 1 in which said hard polymer has a KHN of 20 to 24, said soft polymer has a KHN of 0.5 to 2, said hard and soft polymers are each employed in amounts of from 3 to 7 parts by weight per 100 parts of said principal polymers and said hard polymer is present in relative proportions by weight of from 0.8 to 1.25 parts per each part of said soft polymer.

Claim 7

An aqueous emulsion floor finish containing as the principal film forming polymer a zinc crosslinked acrylic polymer having a Knoop Hardness Number (KHN) within the range of 13 to 19, said principal polymer having been prepared by the emulsion polymerization of a mixture of monomers comprising on a weight basis to to 80% of methyl methacrylate, 15 to 30% of an alkyl acrylate selected from ethylacrylate or butylacrylate, and 5 to 20% of methacrylic acid, said principal polymer having been crosslinked with a zinc crosslinking reagent in an amount on the basis of the weight of said polymer before crosslinking of 1 to 3% of said crosslinking reagent, said floor finish having incorporated therein in combination with said principal polymer the following modified resins: a. from 1 to 10 parts by weight per 100 parts of said principal resin of a hard acrylic polymer having a KHN of 20 to 24, said hard acrylic polymer having been prepared by emulsion polymerization of at least one lower alkyl ester of methacrylic acid; and b. from 1 to 10 parts by weight per 100 parts of said principal resin of a soft acrylic polymer having a KHN of 0.5 to 2, said soft acrylic polymer having been prepared by emulsion polymerization of acrylate monomers selected from (i) at least one lower alkyl ester of acrylic acid, and (ii) a mixture of (i) with at least one acid selected from methacrylic acid, acrylic acid, and lower alkyl esters of methacrylic acid; said hard polymer being present in relative proportions by weight of from 0.5 to 2 parts per each part of said soft polymer.

Claim 8

An aqueous emulsion floor finish containing as the principal film forming polymer a zinc crosslinked acrylic polymer having a Knoop Hardness Number (KHN) within the range of 13 to 19, said principal polymer having been prepared by the emulsion polymerization of a mixture of monomers comprising on a weight basis to to 80% of methyl methacrylate, 15 to 30% of an alkyl acrylate selected from ethylacrylate or butylacrylate, and 5 to 20% of methacrylic acid, said principal polymer having been crosslinked with a zinc crosslinking reagent in an amount on the basis of the weight of said polymer before crosslinking of 1 to 3% of said crosslinking reagent, said floor finish having incorporated therein in combination with said principal polymer the following modified resins: a. from 1 to 10 parts by weight per 100 parts of said principal resin of a hard acrylic polymer having a KHN of 20 to 24, said hard acrylic polymer having been prepared by emulsion polymerization of at least one lower alkyl ester of methacrylic acid; and b. from 1 to 10 parts by weight per 100 parts of said principal resin of a soft acrylic polymer having a KHN of 0.5 to 2, said soft acrylic polymer having been prepared by emulsion polymerization of acrylate monomers selected from (i) at least one lower alkyl ester of acrylic acid, and (ii) a mixture of (i) with at least one acid selected from methacrylic acid, acrylic acid, and lower alkyl esters of methacrylic acid; said hard polymer being present in relative proportions by weight of from 0.5 to 2 parts per each part of said soft polymer.

Claim 9

The floor finish of claim 6 wherein said hard polymer and said soft polymer are each employed in amounts of 3 to 7 parts by weight per 100 parts of said principal resin.

Claim 10

The floor finish of claim 7 in which said hard polymer is present in relative proportions by weight of from 0.8 to 1.25 parts per each part of said soft polymer.

Claim 11

The fLoor finish of claim 6 in which said hard polymer has been prepared essentially from methyl methacrylate.

Claim 12

The floor finish of claim 6 in which said soft polymer has been prepared from a mixture of monomers on a weight basis consisting essentially 55 to 75% of ethyl acrylate, 25 to 45% of methyl methacrylate, and 0 to 5% of acid monomers selected from methacrylic acid, acrylic acid, and mixtures thereof.

Claim 13

The floor finish of claim 6 in which said alkyl acrylate monomer of said principal polymer if ethylacrylate.

Claim 14

An aqueous emulsion floor finish containing as the principal film forming resin a zinc crosslinked acrylic polymer having a Knoop Hardness Number (KHN) of 14 to 18, said principal resin having been prepared by the emulsion polymerization of a mixture of monomers comprising on a weight basis 60 to 70% of methyl methacrylate, 20 to 25% of an alkyl acrylate selected from ethyl acrylate or butyl acrylate, and 10 to 15% of methacrylic acid, said principal resin having been crosslinked with a zinc crosslinking reagent, said floor finish having incorporated therein in combination with said principal resin the following modified resins: a. from 3 to 7 parts by weight per 100 parts of said principal resin of a hard acrylic polymer having a KHN of 20 to 24, said hard acrylic polymer having been prepared by emulsion polymerization of at least one lower alkyl ester of methacrylic acid; and b. from 3 to 7 parts by weight per 100 parts of said principal resin of a soft acrylic polymer having a KHN not over 5.0, said soft acrylic polymer having been prepared by emulsion polymerization of acid monomers selected from (i) at least one lower alkyl ester of acrylic acid, and (ii) a mixture of (i) with at least one acid selected from methacrylic acid, acrylic acid, and lower alkyl esters of methacrylic acid; said hard polymer being present in relative proportions by weight of from 0.8 to 1.25 parts per each part of said soft polymer.

Claim 15

An aqueous emulsion floor finish containing as the principal film forming resin a zinc crosslinked acrylic polymer having a Knoop Hardness Number (KHN) of 14 to 18, said principal resin having been prepared by the emulsion polymerization of a mixture of monomers comprising on a weight basis 60 to 70% of methyl methacrylate, 20 to 25% of an alkyl acrylate selected from ethyl acrylate or butyl acrylate, and 10 to 15% of methacrylic acid, said principal resin having been crosslinked with a zinc crosslinking reagent, said floor finish having incorporated therein in combination with said principal resin the following modified resins: a. from 3 to 7 parts by weight per 100 parts of said principal resin of a hard acrylic polymer having a KHN of 20 to 24, said hard acrylic polymer having been prepared by emulsion polymerization of at least one lower alkyl ester of methacrylic acid; and b. from 3 to 7 parts by weight per 100 parts of said principal resin of a soft acrylic polymer having a KHN not over 5.0, said soft acrylic polymer having been prepared by emulsion polymerization of acid monomers selected from (i) at least one lower alkyl ester of acrylic acid, and (ii) a mixture of (i) with at least one acid selected from methacrylic acid, acrylic acid, and lower alkyl esters of methacrylic acid; said hard polymer being present in relative proportions by weight of from 0.8 to 1.25 parts per each part of said soft polymer.