Base for defoaming compositions

Claim 2

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said microspheres consisting of sodium silicate and a polysalt, and said fragments being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours, wherein said polysalt is an alkali metal polyborate, an ammonium polyborate, an alkali metal polyphosphate or an ammonium polyphosphate.

Claim 3

The defoamer base of claim 1 wherein said microspheres have 0.03 to 2.0 parts by weight of polysalt selected from the group consisting of ammonium pentaborate, sodium pentaborate and sodium hexametaphosphate per part by weight of sodium silicate; a water content of less than about 7% and a density of 4 to 20 lbs./ft. 3 .

Claim 4

The defoamer base of claim 1 wherein the fragments derived from crushing said microspheres have densities of 4 to 8 times the density of the microspheres.

Claim 5

The defoamer base of claim 1 wherein the halo-silane is selected from the group consisting of alkyl, aryl, alkaryl and aralkyl halo-silanes.

Claim 6

The defoamer base of claim 1 wherein the siloxane is selected from the group consisting of alkyl, aryl, aralkyl and alicyclic polysiloxanes having viscosities of 10 to 3000 centistokes.

Claim 7

The defoamer base of claim 5 wherein the siloxane is dimethylpolysiloxane.

Claim 8

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said fragments being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours wherein said microspheres have 0.03 to 2.0 parts by weight of a polysalt selected from the group consisting of ammonium pentaborate, sodium pentaborate and sodium hexametaphosphate per part by weight of sodium silicate; a water content of less than about 7% and a density of 4 to 20 lbs./ft 3 .

Claim 9

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said fragments being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours wherein said microspheres have 0.03 to 2.0 parts by weight of a polysalt selected from the group consisting of ammonium pentaborate, sodium pentaborate and sodium hexametaphosphate per part by weight of sodium silicate; a water content of less than about 7% and a density of 4 to 20 lbs./ft 3 .

Claim 10

The defoamer base of claim 7 wherein the fragments derived from crushing said microspheres have densities of 4 to 8 times the density of the microspheres.

Claim 11

The defoamer base of claim 7 wherein the halo-silane is selected from the group consisting of alkyl, aryl, alkaryl and aralkyl halo-silanes.

Claim 12

The defoamer base of claim 7 wherein the siloxane is selected from the group consisting of alkyl, aryl, aralkyl and alicyclic polysiloxanes having viscosities of 10 to 3000 centistokes.

Claim 13

The defoamer base of claim 10 wherein the siloxane is dimethylpolysiloxane.

Claim 14

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said microspheres consisting of synthetic, fused, water insoluble alkali metal silicate-based glass, and said fragments being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours.

Claim 15

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said microspheres consisting of synthetic, fused, water insoluble alkali metal silicate-based glass, and said fragments being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours.

Claim 16

The defoamer base of claim 12 wherein the alkali metal silicate-base glass is a boro-silicate, a zinc-silicate, a magnesium silicate or an alumino-silicate.

Claim 17

The defoamer base of either of claims 12 or 13 wherein the fragments derived from crushing said microspheres have densities of 4 to 8 times the density of the microspheres.

Claim 18

The defoamer base of either of claims 12 or 13 wherein the halo-silane is selected from the group consisting of alkyl, aryl, alkaryl and aralkyl halo-silanes.

Claim 19

The defoamer base of either of claims 12 or 13 is selected from the group consisting of alkyl, aryl, aralkyl and alicyclic polysiloxanes having viscosities of 10 to 3000 centistokes.

Claim 20

The defoamer base of claim 16 wherein the siloxane is dimethylpolysiloxane.

Claim 21

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said microspheres being of fused glass consisting of at least 40% by weight of SiO 2 , at least 5% by weight of alkali metal oxide and about 5 to 50% by weight of at least one other constituent selected from those conventionally present as optional ingredients in glasses requiring an initial glass forming temperature between 1200° and 1500° C., and said fragment being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours.

Claim 22

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said microspheres being of fused glass consisting of at least 40% by weight of SiO 2 , at least 5% by weight of alkali metal oxide and about 5 to 50% by weight of at least one other constituent selected from those conventionally present as optional ingredients in glasses requiring an initial glass forming temperature between 1200° and 1500° C., and said fragment being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours.

Claim 23

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said microspheres are fused glass bubbles formed by reheating solid glass particles thereby expanding them, said glass particles having a composition of: ______________________________________ SiO.sub.2 60- 80% by weight Na.sub.2 O 5- 16% by weight CaO 5- 25% by weight K.sub.2 O + LiO.sub.2 0- 10% by weight Na.sub.2 O + K.sub.2 O + Li.sub.2 O 5- 16% by weight RO 0- 15% by weight RO.sub.2 0- 20% by weight R.sub.2 O.sub.5 0- 25% by weight Fluorine 0- 5% by weight ______________________________________ wherein, RO represents bivalent metal oxides other than CaO, R 2 O represents tetravalent metal oxides other than SiO 2 , R 2 O 3 represents trivalent metal oxides and R 2 O 5 represents pentavalent metal oxides, said glass particles being reheated and expanded at temperatures 100° to 300° C. lower than the glass forming temperature of 1200° to 1500° C., and said fragments being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours.

Claim 24

A hydrophobic defoamer base suitable to disperse in a water insoluble organic liquid to form a defoamer effective in aqueous systems, said base consisting of: hydrophobic plate-like fragments of crushed microspheres, said microspheres are fused glass bubbles formed by reheating solid glass particles thereby expanding them, said glass particles having a composition of: ______________________________________ SiO.sub.2 60- 80% by weight Na.sub.2 O 5- 16% by weight CaO 5- 25% by weight K.sub.2 O + LiO.sub.2 0- 10% by weight Na.sub.2 O + K.sub.2 O + Li.sub.2 O 5- 16% by weight RO 0- 15% by weight RO.sub.2 0- 20% by weight R.sub.2 O.sub.5 0- 25% by weight Fluorine 0- 5% by weight ______________________________________ wherein, RO represents bivalent metal oxides other than CaO, R 2 O represents tetravalent metal oxides other than SiO 2 , R 2 O 3 represents trivalent metal oxides and R 2 O 5 represents pentavalent metal oxides, said glass particles being reheated and expanded at temperatures 100° to 300° C. lower than the glass forming temperature of 1200° to 1500° C., and said fragments being rendered hydrophobic by coating with 2 to 30% of a halo-silane or a siloxane and cured by heating at 230° to 320° C. for 4 to 24 hours.

Claim 25

The defoamer base of either of claims 18 or 19 wherein the fragments derived from crushing said microspheres have densities of 4 to 8 times the density of the microspheres.

Claim 26

The defoamer base of either of claims 18 or 19 wherein the halo-silane is selected from the group consisting of alkyl, aryl, alkaryl and aralkyl halo-silanes.

Claim 27

The defoamer base of either of claims 18 or 19 wherein the siloxane is selected from the group consisting of alkyl, aryl, aralkyl and alicyclic polysiloxanes having viscosities of 10 to 3000 centistokes.

Claim 28

The defoamer base of claim 22 wherein the siloxane is dimethylpolysiloxane.