GB2039232A - Method of bonding urethane formulations to rubber - Google Patents
Method of bonding urethane formulations to rubber Download PDFInfo
- Publication number
- GB2039232A GB2039232A GB7941986A GB7941986A GB2039232A GB 2039232 A GB2039232 A GB 2039232A GB 7941986 A GB7941986 A GB 7941986A GB 7941986 A GB7941986 A GB 7941986A GB 2039232 A GB2039232 A GB 2039232A
- Authority
- GB
- United Kingdom
- Prior art keywords
- urethane
- tire
- rubber
- adhesive
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2321/00—Characterised by the use of unspecified rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2433/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C08J2433/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Tyre Moulding (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a method wherein uncured urethane formulations are bonded to a cured rubber or synthetic rubber substrate in such a manner so as to provide greater bonding strength than has been achieved previously in urethane formulation bonding to rubber or synthetic rubber. The substrate is cleaned, a coating of a cyanoacrylate adhesive is applied, followed by a liquid or paste urethane formulation while the adhesive is still wet, and then the urethane is cured.
Description
SPECIFICATION
Method of bonding urethane formulations to rubber
The present invention relates to a method of bonding uncured urethane formulations to substrates and particularly to rubber or synthetic rubber substrates.
The desirability of achieving maximum bonding strength between urethane formulations and cured rubber or synthetic rubber substrates has long been known in the art. The bonding of urethane formulations to cured rubber or synthetic rubber substrates has been one of the more difficult problems experienced in the rubber industry and also with users of rubber products. The conventional use of adhesives, primers, bonding agents, etc., available commercially has been unable to provide a urethane-torubber bond that is equal in pull strength to a rubber-to-rubber bond.
Laboratory adhesion tests using conventional methods of applying primers or adhesives agents, such as cyanoacrylates, allowing them to dry and then applying a urethane formulation as a liquid or a paste and allowing itto cure, normally produces a bond strength ranging from 1 to 30 pli (pounds per linear inch). A desirable bond strength should be at least 80 pli.
We have found in the present invention that if the uncured urethane is immediately applied to a rubber or synthetic rubber surface wetted with adhesive before the adhesive dried, the bond between the urethane, after curing, and the rubber or synthetic rubber surface is increased three to four times over the maximum bond strength achieved in prior methods where the adhesive was permitted to dry prior to application of the urethane onto the surface.
The invention of the present application has many uses such as repairing tears or worn spots in rubber-based articles subject to considerable wear.
For example, the method of the present invention could be used effectively in repairing conveyor belts of a rubber or synthetic rubber material, patching tires which have been torn or ripped and even recapping of tires.
As will be appreciated by a person skilled in the art, there is a great economic need for a method which will permit the user to take advantage of the higher abrasion resistance of cured urethane and the cold-cure characteristics of many urethane formulations will result in substantial energy and cost savings. The ability of the user to build on a rubber or synthetic rubber substrate with a cold-curing system that has good adhesion offers a wide range of costsaving industrial applications.
the present invention provides a method of bonding uncured urethane formulations to a cured rubber substrate comprising the steps of: (a) cleaning the substrate surface;
(b) coating the clean substrate surface with a liquid cyanoacrylate adhesive;
(c) coating the substrate surface, wetted with the cyanoacrylate adhesive, with a liquid or paste urethane formulation while the adhesive is still wet; and
(d) permitting the urethane formulation to cure.
The uncured urethane is applied in liquid or paste form until the surface is built up to the desired form or thickness. The urethane is then allowed to cure and after curing has been completed, the repaired surface can be buffed or shaped as desired and can then be used with the repaired area containing the urethane providing greater abrasion resistance than the surrounding rubber base material.
Following the procedure outlined above, it is poss isle to obtain bond strengths in excess of 100 pli.
A particular use of the invention believed to have great commercial significance, is the use of the invention in recapping tires. In conventional practice in recapping tires, a tire is buffed to remove the worn tread and an adhesive is applied to the buffed area.
When the adhesive is no longer wet, an uncured rubber is applied over the adhesive. The tire with the rubber thereon is then placed in a steel mold where, with the application of heat, the rubber is cured and in the process the rubber is bonded to the tire. The conventional recapping process requires the consumption of considerable energy.
In the practice of the present invention in recapping of tires, the tire is buffed and all buffed material removed from the tire. The clean tire is then wetted with a cyanoacrylate adhesive, and before the adhesive has dried, a coating of uncured urethane liquid or paste is immediately applied to the wetted surface. Before the urethane has an opportunity to cure, the tire with the urethane liquid or paste thereon is placed into a mold and additional uncured urethane is pumped into the mold cavity so as to complete the process of building up the desired thickness of tread material on the outer surface of the tire. The urethane is then allowed to cure and with fast curing urethane formulations, the tire can be removed from the mold in about 15 minutes. This time of mold removal can be varied depending upon the cure rate oftheparticularurethaneformulation used.It is preferred that the exothermic reaction of the curing urethane be mild, thus enabling a greater variety of materials to be used in making the mold.
A preferred technique would be to mount the buffed and cleaned tire on a mandrel so that it can rotate in a vertical plane. While rotating, the adhesive is sprayed upon the tire and as the tire continues to rotate, the uncured liquid or paste-like urethane material is applied to the adhesive-wetted surface of the tire. The time element is critical so as to insure the application of the urethane to the surface while the adhesive is still wet. Preferably, the time element would be about five seconds with most urethane formulations considered for practical use. The time element can be controlled either by moving a urethane discharging nozzle closer to the point where an adhesive nozzle sprays the adhesive on the tire or just rotating the tire faster.These are all tech
niques which can be practiced by a person skilled in the art so long as they utilize the inventive concept of
applying the initial uncured urethane to the tire while the adhesive is still wet.
Because of the mild exothermic reaction produced
by the curing of various formulations of urethane, the tire with the initial coating of urethane can be placed in a mold which is formed of plastic material rather than metal molds as conventionally used.
Preferably, the plastic mold would hold the tire casing in a vertical position and one or more inlets to the interior of the mold would enable additional uncured urethane material to be pumped into the mold cavity until it is completely filled with uncured urethane. An air vent would be located at the top of the mold so that as the uncured urethane enters the interior of the mold, entrapped air is forced out of the air-release vent at the top of the mold. The air vent could also be used as an indicator to tell when the mold is filled because the first indication or urethane material in the air-vent opening would be an indication that the mold is filled.
In conventional recapping, mold time varies with the size of the tire being capped. As tire size and tread thickness increase, demold time increases. The reverse is true for urethane-capped tires. The larger the urethane mass, the faster it will react. Thus, small and large tires will take approximately the same demold time.
Because urethane has significantly better abrasion resistance than rubber, it would be possible to recap a tire casing with a thinner layer of urethane and still obtain the same length of service as would be obtained from a recapped tire having a much thicker layer of rubber material. It is estimated that with the practice of the invention as described and applied to automotive tires recapped with urethane material, it would be possible to obtain from 80,000 to 100,000 miles of service compared with from 25,000 to 40,000 miles for rubber tires.
Formulations of the urethane materials which could be used in the practice of this invention can be readily produced by persons skilled in the art from known chemistry techniques in the production of urethanes. A specific reference to the compositions and available sources of commercial supply of urethanes which can be used in the practice of this invention will be found in Chapter Seventeen of the publication RUBBER TECHNOLOGY, edited by
Maurice Morton and published by Von Nostrand
Reinhold Company. To the urethane material, anhydrous fillers can be added, as is known in the art, to introduce properties of hardness, abrasion resistance, tear strength and pigmentation.Such anhydrous fillers include, for example, a variety of talcs, hydrated aluminum oxides, calcium carbonate, diatomaceous earth, silica smoke, carbon black, fiber-glass, titanium oxide, zinc oxide, bentonite and such other fillers which are commonly used in urethane technology. The fillers are used in proportions to produce the characteristics of the properties desired in the urethane material.
The preferred cyanoacrylate adhesive, in the practice of the present invention, would be a composition containing alkyl esters of cyanoacrylic acid as disclosed in U.S. Patent No. 2,794,788. Such adhesives can be of different viscosities. We have found that a medium viscosity of from 100 to 120 CP Brookfield at 78"F is preferable to prevent excessive penetration of the adhesive into the rubber substrate and to provide adequate "working time" to apply the
polyurethane coating while the adhesive is still wet.
For additional information regarding cyanoacrylate adhesives, attention is directed to the article entitled "CYANOACRYLATE ADHESIVES" pages 569 to 580 from the second edition of "HANDBOOK OF
ADHESIVES" published by Von Nostrand Reinhold
Company.
In the foregoing description and in the claims, the use of the terms "rubber" and "synthetic rubber" are not intended to cover silicone rubber.
Claims (6)
1. A method of bonding uncured urethane formulations to a cured rubber substrate comprising the steps of:
(a) cleaning the substrate surface;
(b) coating the cleaned substrate surface with a liquid cyanoacrylate adhesive;
(c) coating the substrate surface, wetted with the cyanoacrylate adhesive, with a liquid or paste urethane formulation while the adhesive is still wet; and
(d) permitting the urethane formulation to cure.
2. The method of claim 1, wherein the urethane formulation is applied to the substrate surface wetted with the cyanoacrylate adhesives in an initial coating and additional amounts of urethane are applied before the initial coating of urethane has cured until the desired volume of urethane is present.
3. The method of claim 2, wherein said volume of urethane is molded into final form.
4. The method of claim 2, wherein said volume of urethane is buffed into final form.
5. A method of recapping a rubber tire with a urethane formulation, comprising the steps of:
(a) buffing down the tire casing surface to remove old tread and cleaning said surface of extraneous materials;
(b) coating the buffed tire causing surface with a liquid cyanoacrylate adhesive to wet said surface with adhesive;
(c) applying an initial liquid or paste coating of an uncured urethane formulation onto said surface while said surface is still wet with the cyanoacrylate adhesive;
(d) placing said tire in a mold having an interior configuration of the desired shape of the recapped portion of the tire;
(e) injecting additional liquid or paste urethane formulation into said mold before the initial urethane has cured and filling the interior cavity of the mold;
(f) removing the recapped tire from the mold as soon as the urethane formulation has set; and
(g) allowing said urethane formulation to cure.
6. A method of bonding urethane formulations to a cured rubber substrate substantially as herein described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US96963278A | 1978-12-14 | 1978-12-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2039232A true GB2039232A (en) | 1980-08-06 |
| GB2039232B GB2039232B (en) | 1982-10-27 |
Family
ID=25515785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7941986A Expired GB2039232B (en) | 1978-12-14 | 1979-12-05 | Method of bonding urethane formulations to rubber |
Country Status (29)
| Country | Link |
|---|---|
| JP (1) | JPS5582632A (en) |
| KR (1) | KR830000928B1 (en) |
| AR (1) | AR220023A1 (en) |
| AT (1) | AT369405B (en) |
| AU (1) | AU513525B2 (en) |
| BE (1) | BE880592A (en) |
| BR (1) | BR7908082A (en) |
| CA (1) | CA1125110A (en) |
| CH (1) | CH643182A5 (en) |
| CS (1) | CS222291B2 (en) |
| DD (1) | DD147923A5 (en) |
| DE (1) | DE2950523C2 (en) |
| ES (1) | ES8101996A1 (en) |
| FI (1) | FI68637C (en) |
| FR (1) | FR2444059A1 (en) |
| GB (1) | GB2039232B (en) |
| GR (1) | GR73587B (en) |
| IE (1) | IE49013B1 (en) |
| IL (1) | IL58836A (en) |
| IN (1) | IN153375B (en) |
| IT (1) | IT1164850B (en) |
| MX (1) | MX153385A (en) |
| NL (1) | NL184114C (en) |
| NO (1) | NO151242C (en) |
| NZ (1) | NZ192230A (en) |
| PL (1) | PL123640B1 (en) |
| PT (1) | PT70582A (en) |
| SE (1) | SE446270B (en) |
| ZA (1) | ZA796482B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993010963A1 (en) * | 1991-11-26 | 1993-06-10 | Colway Tyres Limited | Tyres with plastics tread and method for their manufacturing |
| US8261798B2 (en) | 2006-10-30 | 2012-09-11 | Michelin Recherche Et Technique S.A. | Polyurethaneurea system |
| US8980433B2 (en) | 2006-10-30 | 2015-03-17 | Michelin Recherche Et Technique S.A. | Polyurethaneurea system |
| US11247424B1 (en) | 2016-12-13 | 2022-02-15 | Bridgestone Americas Tire Operations, Llc | Methods for retreading tires |
| USD1029566S1 (en) * | 2020-03-12 | 2024-06-04 | StoreBound LLC | Popcorn maker |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58148743A (en) * | 1982-03-01 | 1983-09-03 | Kouhoku Gomme Seisakusho:Kk | Bonding method of urethane rubber to general purpose rubber |
| CA1243154A (en) * | 1984-12-19 | 1988-10-18 | The Goodyear Tire & Rubber Company | Polyurethane bonded to cured rubber |
| JPS63236648A (en) * | 1987-03-25 | 1988-10-03 | 岩本 鐘吉 | Method of repairing mat |
| US5079098A (en) * | 1988-03-16 | 1992-01-07 | Loctite Corporation | Primer for bonding low surface energy plastics with cyanoacrylate adhesives and bonding method employing same |
| US5066743A (en) * | 1989-03-27 | 1991-11-19 | Loctite Corporation | Two-part composition comprising a cyanoacrylate adhesive and a primer comprising a tertiary ammonium carboxylate compound |
| JP6075199B2 (en) * | 2013-05-10 | 2017-02-08 | 東亞合成株式会社 | Shoe sole repair method and shoe sole repair body |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1389803A (en) * | 1964-03-11 | 1965-02-19 | Goodyear Tire & Rubber | Process for obtaining a composite elastic structure and product obtained by its implementation |
| US3648748A (en) * | 1969-08-18 | 1972-03-14 | Goodyear Tire & Rubber | Tire having polyurethane laminate thereon |
| DE2354642A1 (en) * | 1972-12-18 | 1974-06-20 | Du Pont | BONDING A URETHANE POLYMERISATE TO A RUBBER |
-
1979
- 1979-11-26 NZ NZ192230A patent/NZ192230A/en unknown
- 1979-11-28 SE SE7909803A patent/SE446270B/en not_active IP Right Cessation
- 1979-11-29 IN IN860/DEL/79A patent/IN153375B/en unknown
- 1979-11-29 ZA ZA00796482A patent/ZA796482B/en unknown
- 1979-11-30 IL IL58836A patent/IL58836A/en unknown
- 1979-12-04 AU AU53438/79A patent/AU513525B2/en not_active Ceased
- 1979-12-05 CA CA341,228A patent/CA1125110A/en not_active Expired
- 1979-12-05 GB GB7941986A patent/GB2039232B/en not_active Expired
- 1979-12-07 GR GR60714A patent/GR73587B/el unknown
- 1979-12-07 MX MX180375A patent/MX153385A/en unknown
- 1979-12-10 NL NLAANVRAGE7908870,A patent/NL184114C/en not_active IP Right Cessation
- 1979-12-11 BR BR7908082A patent/BR7908082A/en unknown
- 1979-12-12 IE IE2406/79A patent/IE49013B1/en unknown
- 1979-12-12 AR AR279266A patent/AR220023A1/en active
- 1979-12-12 CS CS798707A patent/CS222291B2/en unknown
- 1979-12-12 FI FI793887A patent/FI68637C/en not_active IP Right Cessation
- 1979-12-12 IT IT51064/79A patent/IT1164850B/en active
- 1979-12-12 DE DE2950523A patent/DE2950523C2/en not_active Expired
- 1979-12-12 PT PT70582A patent/PT70582A/en unknown
- 1979-12-13 NO NO794081A patent/NO151242C/en unknown
- 1979-12-13 CH CH1104679A patent/CH643182A5/en not_active IP Right Cessation
- 1979-12-13 JP JP16213179A patent/JPS5582632A/en active Pending
- 1979-12-13 AT AT0786479A patent/AT369405B/en not_active IP Right Cessation
- 1979-12-13 BE BE1/9644A patent/BE880592A/en not_active IP Right Cessation
- 1979-12-13 KR KR1019790004422A patent/KR830000928B1/en active
- 1979-12-13 ES ES486867A patent/ES8101996A1/en not_active Expired
- 1979-12-13 PL PL1979220388A patent/PL123640B1/en unknown
- 1979-12-13 DD DD79217644A patent/DD147923A5/en unknown
- 1979-12-14 FR FR7930731A patent/FR2444059A1/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993010963A1 (en) * | 1991-11-26 | 1993-06-10 | Colway Tyres Limited | Tyres with plastics tread and method for their manufacturing |
| GB2274815A (en) * | 1991-11-26 | 1994-08-10 | Colway Tyres Limited | Tyres with plastics tread and method for their manufacturing |
| US8261798B2 (en) | 2006-10-30 | 2012-09-11 | Michelin Recherche Et Technique S.A. | Polyurethaneurea system |
| US8980433B2 (en) | 2006-10-30 | 2015-03-17 | Michelin Recherche Et Technique S.A. | Polyurethaneurea system |
| US11247424B1 (en) | 2016-12-13 | 2022-02-15 | Bridgestone Americas Tire Operations, Llc | Methods for retreading tires |
| USD1029566S1 (en) * | 2020-03-12 | 2024-06-04 | StoreBound LLC | Popcorn maker |
Also Published As
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4240852A (en) | Method of bonding urethane formulations to rubber | |
| CA1125110A (en) | Method of bonding urethane formulations to rubber | |
| PT83212B (en) | PROCESS FOR TRANSMITTING A DECORATIVE ORNAMENTATION TO A PNEUMATIC, JOINT TO APPLY THIS ORNAMENTATION AND ORNAMENTATION PROPOSED DITA | |
| US3501564A (en) | Method for bonding polyurethane to other materials | |
| US5110629A (en) | Method for preparing rubber surface for adhesion to polymeric formulation | |
| US5997786A (en) | Method for bonding rigid substrates | |
| EP1256438A3 (en) | A method of curing foam filled tires and rim used thereby | |
| JPH03202326A (en) | Treatment process of tyer-vulcanizing bladder | |
| JPS6234538B2 (en) | ||
| US4061174A (en) | Fixing of shaped bodies to metal casting moulds | |
| IE37711B1 (en) | Method of producing multi-component articles | |
| CA1230020A (en) | Adhering cured polymers or prepolymers to cured elastomer utilizing hypochlorous acid treating agent | |
| GB2068819A (en) | Polyurethane mouldings | |
| JPH01500984A (en) | Injection molding method using new primer | |
| US2858571A (en) | Method of making rubber soles | |
| US3513047A (en) | Process for producing cushionless retreaded tires | |
| GB2025793A (en) | Method of Applying Rubber to a Substrate | |
| DE2305190A1 (en) | METHOD AND DEVICE FOR TIRE TREADRING | |
| KR910003719B1 (en) | Method for giving stickness on the surface of silicone rubber | |
| DE69729873D1 (en) | METHOD FOR THE ANTI-ADHESIVE TREATMENT OF A MELT-ADHESIVE WITH ADHESIVE END SURFACE | |
| CN115742495A (en) | High-wear-resistance silica gel gasket and processing method thereof | |
| JPS644314A (en) | Manufacture of foam molded product | |
| TWI302494B (en) | ||
| JPH06190835A (en) | Production of silicone rubber molded piece | |
| JPS5920709A (en) | Seal for tire, tire with seal and pasting method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |