US 5,098,472 AGranted

Preservative composition

AssigneesCommonwealth Scientific and Industrial Research Organization, Koppers Australia Pty. Limited

InventorsJohn B. Watkins, Harry Greaves, Chen W. Chin

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Abstract

There is disclosed a preservative composition which is ultra stable in the presence of wood extractives comprising (a) an emulsion of a wood preserative grade creosote; (b) 5-95% water; (c) one or more pre-dispersed micronized pigments; (d) a rheology structuring agent present in an amount of 2.5 weight percent or less; (e) 0.25 to 10 weight percent of a soap which is an alkali metal salt of a wood derived resin acid; (f) 0.1 to 5 weight percent of a surfactant; (g) 0.25 to 2 weight percent of a natural or synthetic pigment modifying resins or anti-settle additive; and (h) 0.25 to 5 weight percent of a lignin sulfonate. The emulsion is produced under conditions of ultra-high sheer. A process for the manufacture of the preservative composition is also disclosed.

Claims18

Dependent claims

A preservative composition which is ultra stable in the presence of wood extractives comprising

(a) an emulsion of a wood preservative grade creosote;
(b) 5-95% water;
(c) one or more pre-dispersed micronized pigments;
(d) a rheology structuring agent present in an amount of 2.5 weight percent or less, said rheology structuring agent being selected from the group consisting of carboxyvinyl polymers having molecular weight sufficiently high to enable said polymers to impart thixotropic properties to the composition, modified hydrogenated castor oil, bentonite clays, fumed silica, polysaccharides, naphthalenes, fatty acid derivatives and water soluble polyethylene oxides having molecular weight sufficient to enable said polyethylene oxides to impart theopectic properties to the composition;
(e) 0.25 to 10 weight percent of a soap which is an alkali metal salt of a wood derived resin acid;
(f) 0.1 to 5 weight percent of one of the surfactants selected from the group consisting of nonylphenyl ethoxylates, alkanolamides, soya lecithins, ethoxylated sorbitan esters, alkyl and glycol esters, sulfonated castor oils, amine ethoxylates, acrylic copolymers, fluorinated surfactants, poly(organosiloxane) surfactants, fatty acid soaps, sodium lauryl sulfates, octyl phenol ethoxylates, cetyl stearyl alcohol ethoxylates, propylene glycol ethoxylates, alkyl aryl ethers, ethylene oxide condensates and sulfonates;
(g) 0.25 to 2 weight percent of one of the natural or synthetic pigment modifying resins or anti-settle additives selected from the group consisting of gum copol, gum rosin, vatica resins, shellac, wood rosin, tall oil rosin, chinese wood oil, high molecular weight primary amines derived from pine resin acids, casein, aliphatic resins, aromatic resins, coumaroneindene, terpene resins, polyterpene resins, terpene phenol, alkyd resins, rhodenes, polyurethane resins, silicone resins and unmodified hydrogenated castor oil;
(h) 0.25 to 5 weight percent of a lignin sulfonate;
said emulsion having been produced under conditions of ultra-high sheer.

6 more elements

A process for the manufacture of a preservative composition, which process comprises the steps of:

(i) dissolving 2.5% by weight or less, based on the total weight of said composition, of one of the group of rheology structuring agents consisting of carboxyvinyl polymers having molecular weight sufficiently high to enable said polymers to impart thixotropic properties to the composition, bentonite clays, fumed silica, polysaccharides, naphthalene, fatty acid derivatives, water soluble polyethylene oxides having molecular weight sufficient to enable said polyethylene oxides to impart rheopectic properties to the composition, and modified hydrogenated castor oil;
in 5 to 95% by weight of water based on the total weight of said composition to form a first solution,
(ii) aging the first solution for at least 8 hours,
(iii) dissolving or forming from 0.25-10 weight percent of a soap which is an alkali metal salt of a wood derived resin acid, and dissolving from 0.1 to 5% by weight based on the total weight of said composition of one of the group of surfactants consisting of nonylphenylethoxylates, alkanolamides, soya lecithins, ethoxylated sorbitan esters, alkyl and glycol esters, sulfonated castor oils, amine ethoxylates, acrylic copolymers, fluorinated surfactants, poly(organosiloxane) surfactants, fatty acid soaps, sodium lauryl sulfates, octyl phenol ethoxylates, cetyl stearyl alcohol ethoxylates, propylene glycol ethoxylates, alkyl aryl ethers, ethylene oxide condensates and sulfonates, in the aged first solution, concurrently or sequentially in any order, to form a second solution;
(iv) adding the second solution to creosote and forming a first emulsion under conditions of ultra-high shear;
(v) adding at least one pre-dispersed micronised pigment to the first emulsion;
(vi) adding from 0.25 to 5% by weight based on the weight of the composition of a lignin sulfonate to said first emulsion to form a second emulsion;
and
(vii) adding to said second emulsion from 0.25 to 2% by weight based on the weight of the composition of a natural resin;
said process further comprising mixing under conditions of ultra-high shear after each of steps (v), (vi) and (vii).

7 more elements

A process for the manufacture of a preservative composition, which process consists of the following steps exclusively in the order presented

(i) dissolving 2.5% by weight or less, based on the total weight of said composition, of one of the group of rheology structuring agents consisting of carboxyvinyl polymers having molecular weight sufficiently high to enable said polymers to impart thixotropy to the composition, bentonite clays, fumed silica, polysaccharides, naphthalenes, fatty acid derivatives, water soluble polyethylene oxides having molecular weight sufficient to enable said polyethylene oxides to impart rheopexy to the composition and modified hydrogenated castor oil in 5 to 95% by weight of water based on the total weight of said composition to form a first solution,
(ii) aging the first solution for at least 8 hours to complete solvation,
(iii) dissolving or forming from 0.25 to 10 weight per cent of a soap which is an alkali metal salt of a wood derived resin acid, and dissolving from 0.1 to 5% by weight based on the total weight of said composition of one of the group of surfactants consisting of nonylphenylethoxylates, alkanolamides, soya lecithins, ethoxylated sorbitan esters, alkyl and glycol esters, sulfonated castor oils, amine ethoxylates, acrylic copolymers, fluorinated surfactants poly(organosiloxane) surfactants, fatty acid soaps sodium lauryl sulfates, octyl phenyl ethoxylates, cetyl stearyl alcohol ethoxylates, propylene glycol ethoxylates, alkyl aryl ethers, ethylene oxide condensates and sulfonates, in the aged first solution in order to form a second solution;
(iv) adding the second solution to creosote and forming a first emulsion under conditions of ultra-high shear;
(v) adding at least one pre-dispersed micronised pigment to the first emulsion;
(vi) adding from 0.25 to 5% by weight based on the weight of the composition of a lignin sulfonate to said first emulsion to form a second emulsion;
and
(vii) adding to said second emulsion from 0.25 to 2% by weight based on the weight of the composition of a pigment modifying resin;
said process further comprising mixing under conditions of ultra-high shear after each of steps (v), (vi) and (vii).

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/585,279Filed 13 Sep 1990 · continuation
Priority: AU PF986717 Jun 1983
Granted: 24 Mar 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

C09D 15/00
Woodstains
B27K 3/005
Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation…
B27K 3/44
Organic impregnating agents: tar; Mineral oil
B27K 3/50
Organic impregnating agents: mixtures of different organic impregnating agents