# US 5,348,672 A · Water-soluble lubricants for hot plastic working

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- Number: US 5,348,672 A
- Document ID: US5348672A
- Status: Granted
- Kind: A
- Application number: 08/012,744
- Filed: 1993-02-03
- Granted: 1994-09-20
- Earliest claimed: 1992-04-02
- Assignees: Nippon Graphite Industries Ltd.
- Inventors: Tadao Ohkura; Mamoru Ashida
- Web page: https://patentgrep.com/patent/US5348672A

## CPC

- C10M 173/02: not containing mineral or fatty oils
- C10M 2201/02: Water
- C10M 2207/123: polycarboxylic
- C10M 2207/129: having hydrocarbon chains of thirty or more carbon atoms
- C10M 2207/14: having carboxyl groups bound to carbon atoms of six-membered aromatic rings
- C10M 2207/142: polycarboxylic
- C10M 2207/22: Acids obtained from polymerised unsaturated acids
- C10M 2209/04: containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical
- C10M 2209/06: containing monomers having an unsaturated radical bound to an acyloxy radical of saturated carboxylic or carbonic acid
- C10M 2209/062: Vinyl esters of saturated carboxylic or carbonic acids, e.g. vinyl acetate
- C10M 2209/084: Acrylate; Methacrylate
- C10N 2040/24: without essential removal of material {, e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding}; Punching metal
- C10N 2040/241: {Manufacturing joint-less pipes}
- C10N 2040/242: {Hot working}
- C10N 2040/243: {Cold working}
- C10N 2040/244: {of specific metals}
- C10N 2040/245: {Soft metals, e.g. aluminum}
- C10N 2040/246: {Iron or steel}
- C10N 2040/247: {Stainless steel}
- C10N 2050/01: {Emulsions, colloids, or micelles}
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## Abstract

A water-soluble lubricant for hot plastic working consists essentially of (a) 0.1-30% by weight of a resin powder having a particular particle size distribution, (b) 0.1-30% by weight in total of alkali metal salts of isophthalic acid and adipic acid, (c) 0.1-10% by weight of a water-soluble high polymer, and (d) the balance being water.

## Claims

### Claim 1

A water-soluble lubricant for hot plastic working consisting essentially of (a) 0.1-30% by weight of a resin powder having a particle size distribution that an average particle size is 0.1-10 .mu.m and an amount of particles having a particle size of not more than 0.1 .mu.m is not more than 5% by weight and an amount of particles having a particle size of not less than 10 .mu.m is not more than 5% by weight, (b) 0.1-30% by weight in total of alkali metal salts of isophthalic acid and adipic acid, (c) 0.1-10% by weight of a water-soluble high polymer, and (d) the balance being water.

### Claim 2 (depends on 1)

A water-soluble lubricant according to claim 1, wherein said resin powder is selected from cellulose resin, acrylic resin, polyethylene resin, epoxy resin, phenolic resin, polyester resin, allyl resin and melamine cyanurate resin.

### Claim 3 (depends on 1)

A water-soluble lubricant according to claim 1, wherein an alkali metal used in said alkali metal salt is sodium or potassium.

### Claim 4 (depends on 1)

A water-soluble lubricant according to claim 1, wherein said polymer is selected from carboxymethyl cellulose, sodium polycarboxylate, copolymer of isobutylene and maleic anhydrate and polyvinyl alcohol.

### Claim 5 (depends on 1)

A process for lubricating a mold to prevent sticking of a substrate in the
mold during a hot forging operation, said process comprising the following
steps:
a) coating the mold with a lubricating composition as claimed in claim 1;
b) depositing the substrate into the coated mold;
c) hot forging the substrate in the mold; and
d) removing the hot forged substrate from the mold.

### Claim 6 (depends on 5)

A process for lubricating a mold as claimed in claim 5 wherein the mold is at a temperature of between about 150.degree.-300.degree. C. during the coating step a.

### Claim 7 (depends on 6)

A process for lubricating a mold as claimed in claim 6 wherein the hot forging of step c is conducted at a temperature of between about 1150.degree.-1200.degree. C.

### Claim 8 (depends on 5)

A process for lubricating a mold as claimed in claim 5 wherein the substrate is steel.