USRE23697E - Sponge rubber composition - Google Patents
Sponge rubber composition Download PDFInfo
- Publication number
- USRE23697E USRE23697E US23697DE USRE23697E US RE23697 E USRE23697 E US RE23697E US 23697D E US23697D E US 23697DE US RE23697 E USRE23697 E US RE23697E
- Authority
- US
- United States
- Prior art keywords
- latex
- rubber
- nitrous oxide
- pressure
- sponge
- 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.)
- Expired
Links
- 239000000203 mixture Substances 0.000 title description 19
- 229920001971 elastomer Polymers 0.000 title description 17
- 239000005060 rubber Substances 0.000 title description 17
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 29
- 229920000126 latex Polymers 0.000 description 25
- 239000004816 latex Substances 0.000 description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 14
- 239000001272 nitrous oxide Substances 0.000 description 14
- 239000007789 gas Substances 0.000 description 10
- 239000001569 carbon dioxide Substances 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 7
- 239000006185 dispersion Substances 0.000 description 7
- 239000006260 foam Substances 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- 229920001084 poly(chloroprene) Polymers 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 229910052708 sodium Inorganic materials 0.000 description 6
- 239000004014 plasticizer Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 244000043261 Hevea brasiliensis Species 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 229920001821 foam rubber Polymers 0.000 description 4
- 229920003052 natural elastomer Polymers 0.000 description 4
- 229920001194 natural rubber Polymers 0.000 description 4
- 229920000915 polyvinyl chloride Polymers 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 235000015112 vegetable and seed oil Nutrition 0.000 description 3
- 239000008158 vegetable oil Substances 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 description 2
- 239000005062 Polybutadiene Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 229940044172 calcium formate Drugs 0.000 description 2
- 239000004281 calcium formate Substances 0.000 description 2
- 235000019255 calcium formate Nutrition 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002857 polybutadiene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- GRYSXUXXBDSYRT-WOUKDFQISA-N (2r,3r,4r,5r)-2-(hydroxymethyl)-4-methoxy-5-[6-(methylamino)purin-9-yl]oxolan-3-ol Chemical compound C1=NC=2C(NC)=NC=NC=2N1[C@@H]1O[C@H](CO)[C@@H](O)[C@H]1OC GRYSXUXXBDSYRT-WOUKDFQISA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000905957 Channa melasoma Species 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 229920006387 Vinylite Polymers 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 210000000941 bile Anatomy 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- NFMHSPWHNQRFNR-UHFFFAOYSA-N hyponitrous acid Chemical compound ON=NO NFMHSPWHNQRFNR-UHFFFAOYSA-N 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000131 polyvinylidene Polymers 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions 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
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/032—Impregnation of a formed object with a gas
-
- 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
- C08J2321/02—Latex
Definitions
- This invention relates to a sponge rubber com- Plasticizer, 30-1 (a vegetable oil) ..cc 1. Sensltizer, a 25% dispersion of sodium posm silicofluoride cc 2.3
- an aqueous dispersion of her hi h composition does not neces t using 10 natural rubber o, solid gasifying substances.
- the foregoing mixtures are impregnated in a
- These objects of the invention are flccom- 215 closed container with nitrous oxide at from so plished by mixing latex under pressure with other suitable materials, including a plasticizer, to form the composition of the invention and releasing the pressure whereby a foam is formed, and then heating said foam to cure and stabilize it.
- these objects of the invention are accomplished by producing a rubber foam by the use of nitrous oxide (N20).
- nitrous oxide N20
- Unexpected results occur from the use of nitrous oxide in that the foaming takes place with a decrease in pressure upon the fluid rubber [latex] being impregnated with nitrous oxide; the foam obtained can then be vulcanized, whereby the sponge is obtained.
- albumen tolatex facilitates foaming still more and also increases the stability ofthe foam. It has been found that .an amount of 2% albumen with regard to the [latex] fluid rubber is the optimal quantity in case a soft sponge is to be produced, while 5% albumen gives better results in the case of a hard sponge. Other foaming agents operative with satisfaction are proteins.
- neoprene latex In the case of neoprene latex, it is necessary to maintain the mixture at 40 to 41 F. This refrigeration effect permits the use of a dormant coagulant or gelling agent, such as sodium silicofluoride (NaiSiFa) or calcium formate;
- a dormant coagulant or gelling agent such as sodium silicofluoride (NaiSiFa) or calcium formate
- sponge is formed thereby having a very fine bubble formation with the bubbles of gas interconnected. This gives a very strong and soft sponge of homogeneous character. It can be cast in very thick sections as well as thin sections and constitutes a mass production item which can be continuously produced.
- the temperatureof vulcanization depends upon the type of rubber, its accelerators, etc.
- the time of vulcanization likewise varies.
- the problem involved in its solution is well-known in the rubber industry and needs no description here except that an oven temperature of from 200 to 250 F. has been found satisfactory.
- the length of time varies greatly.
- Henry's law states that the mass of a. soluble gas that dissolves in a definite mass of liquid at a given'temperature is very nearly directed proportional to the partial pressure of the gas and is valid for gases that do not unite chemically with the solvent. This means that as the pressure increases, the amount. of dissolved gas increases proportionally. 7
- nitrous oxide is the anhydride of hyponitrous acid, the breakdown of this acid is irreversible. It has therefore been i'ound that nitrous oxide does not chemically combine with water.
- Nitrous oxide has been incorporated into natural and synthetic latices and into mixtures of these fluid rubbers using pressures of from 100 p. s. i. to 300 p. s. i. A pressure of 80 p. s. i. on the nitrous oxide incorporated less gas than did 100 p. s. 1.
- the latices that is fluid rubbers may be also converted to foam by simply bubbling nitrous oxide through them under atmospheric pressure.
- Carbon dioxide under pressure of 100 p. s.- i. was bubbled through and inco porated in natural latex coniined in a closed vessel. After the latex was saturated with carbon dioxide, it was foamed by letting the carbon dioxide escape from the ves sel through a valve.
- the foam contained curds of coagulated latex. Pipes and valves at-' tached to the pressure vessel were coated on the inside and at places almost clogged with this coagulated latex. About one third of the latex charge ooasulated in the bomb.
- Carbon dioxide dissolves in water under pressure; carbonic acid has little or no eflect on either synthetic or natural latices. However, un-
- the polyvinyl chlorides as is known are vinyl esters termed in the trade as "Vinylite and are members of a class of resinous thermoplastics possessed of rubbery characteristics.
- a composition for producing sponge rubber comprising an aqueous dispersion of a rubber selected from the group of natural rubber, polychloroprene latex, polyvinyl chloride latex, polybutadiene latices and mixtures thereof, a small amount of a vegetable oil as a plasticizer, from substantially l to 2.3 percent of a heat sensitizer selected from the group consisting of sodium silioo fluoride and calcium formate, impregnated. with nitrous oxide at a pressure of from 80 to 250 lbs., said composition being maintained at approximately 40 to 41 F. and having the property to expand upon release from a container into a rubber foam.
- composition of claim 1 in which the :aqueous dispersion of rubber is natural rubber tex.
- a composition for producing sponge rubber comprising an aqueous dispersion of a mixture comprising polyvinyl chloride, a small amount of vegetable oil as a plasticizer, from substantially 1 to 2.3% of a heat-sensitizer selected from .the group consisting of sodium silicojluoride and calcium jormate, impregnated with nitrous oxide der pressure, this weak acid can react with enough of the sodium hydroxide in synthetic latex or ammonium hydroxide in natural latex to cause coagulation. When carbon dioxide isbubbled through latex, enough of the stabilizing hydroxide is converted to the carbonate to cause coagulation. Thisunexpectedresultwiththeuseofnitr oxide has indicated that nitrous oxide is the only gas suitab1e'ior4oaming latices by releasing the pressure required to dissolve the gas in the latex.-
- this foamed latex after being injected into the mold and committed, can be cured in hot water or with steam or by the application oi infrared heat.
- nitrous oxide is the only common gas which is suitable for producing foamed latex becauseothercommoninertgasesaretooinsolubleinthelatex.
Description
Reissued Aug. 4, 1953 V R UNITED STATES PA ENT OFFICE SPONGE RUBBER COMPOSITION No Drawing. Original No. 2,567,950, dated September 18, 1951. Serial No. 32,717, June 12, 1948.
Application for reissue September 8, 1952, Serial No. 308,500
3 Claims.
Matter enclosed in heavy brackets I: II appears in the original patent but forms no part of this remote specification; matter printed in italics indicates the additions made by reissue.
- 2 This application is a continuation-impart of I g the application filed in the name of William R. Neoprene latex. an aqueous emulsion or Stauifer, Serial No. 770,109, filed August 22, 1947, neoprene r-ubber gm 100.-
and entitled Method and Apparatus for Mair.- ing sponge Rubber and now abandoned.
This invention relates to a sponge rubber com- Plasticizer, 30-1 (a vegetable oil) ..cc 1. Sensltizer, a 25% dispersion of sodium posm silicofluoride cc 2.3
on. It is an object of this invention to provide a 11 v composition for the manufacture of sponge rub- Natural latex. an aqueous dispersion of her hi h composition does not neces t using 10 natural rubber o, solid gasifying substances. Foaming agent, egg albumen cc-.. 2.5 11; 1 another object of this inven o o p Plasticizer, 30-1 2,5 ide a composition for the manu actur of 9 8 Activator, zinc oxide 2,0 rubber Produc s which does not equire t e u Sensitizer, a dispersion of sodium of autoclaves or closed molds. 15 silicofluoride 1 o It is still another object of this invention to provide a rubber foam without the use of heat. m Y
It is another object of the invention to pro- Natural latex. an aqueous dispersion of vide a composition useful for making rubber foam natural rubber ee 50, at the point desired, for instance within automo- 2o Nwprene latex. 1 0-2 087 cc 5o, bile bodies, in railway cars for sound installa- Plasticizalr cc 1, tion and other places of similar character and sensitize!" di persion of sodium then vuloanizing the foamed composition in silimfluoride cc 2,3 position- The foregoing mixtures are impregnated in a These objects of the invention are flccom- 215 closed container with nitrous oxide at from so plished by mixing latex under pressure with other suitable materials, including a plasticizer, to form the composition of the invention and releasing the pressure whereby a foam is formed, and then heating said foam to cure and stabilize it. More specifically, these objects of the invention are accomplished by producing a rubber foam by the use of nitrous oxide (N20). Unexpected results occur from the use of nitrous oxide in that the foaming takes place with a decrease in pressure upon the fluid rubber [latex] being impregnated with nitrous oxide; the foam obtained can then be vulcanized, whereby the sponge is obtained.
The addition of albumen tolatex facilitates foaming still more and also increases the stability ofthe foam. It has been found that .an amount of 2% albumen with regard to the [latex] fluid rubber is the optimal quantity in case a soft sponge is to be produced, while 5% albumen gives better results in the case of a hard sponge. Other foaming agents operative with satisfaction are proteins.
Examples of compounds The following are typical examples of compounds which I have successfully used.
In the case of neoprene latex, it is necessary to maintain the mixture at 40 to 41 F. This refrigeration effect permits the use of a dormant coagulant or gelling agent, such as sodium silicofluoride (NaiSiFa) or calcium formate;
to 250 pounds. A pressure of approximately 200 pounds has been found most desirable.
It is desirable to agitate the mixture after impregnation to bring about a thorough and uniform distribution of the gas in the latex.
As soon as the impregnated liquid is released, asthrough a hose nozzle, it immediately foams. The product so foaming is then subjected to heat of vulcanization either by infrared ray lamp, induction heating or by convection heating. A
sponge is formed thereby having a very fine bubble formation with the bubbles of gas interconnected. This gives a very strong and soft sponge of homogeneous character. It can be cast in very thick sections as well as thin sections and constitutes a mass production item which can be continuously produced.
The temperatureof vulcanization depends upon the type of rubber, its accelerators, etc. The time of vulcanization likewise varies. The problem involved in its solution is well-known in the rubber industry and needs no description here except that an oven temperature of from 200 to 250 F. has been found satisfactory. The length of time varies greatly.
Henry's law states that the mass of a. soluble gas that dissolves in a definite mass of liquid at a given'temperature is very nearly directed proportional to the partial pressure of the gas and is valid for gases that do not unite chemically with the solvent. This means that as the pressure increases, the amount. of dissolved gas increases proportionally. 7
Although nitrous oxide is the anhydride of hyponitrous acid, the breakdown of this acid is irreversible. It has therefore been i'ound that nitrous oxide does not chemically combine with water. V
Nitrous oxide has been incorporated into natural and synthetic latices and into mixtures of these fluid rubbers using pressures of from 100 p. s. i. to 300 p. s. i. A pressure of 80 p. s. i. on the nitrous oxide incorporated less gas than did 100 p. s. 1. However. the latices that is fluid rubbers may be also converted to foam by simply bubbling nitrous oxide through them under atmospheric pressure.
By way of contrast, carbon-dioxide has been tried and found undesirable because carbon dioxide, although considerably more soluble in water than nitrous oxide, reacts with water forming carbonic acid which coagulates latices.
Carbon dioxide under pressure of 100 p. s.- i. was bubbled through and inco porated in natural latex coniined in a closed vessel. After the latex was saturated with carbon dioxide, it was foamed by letting the carbon dioxide escape from the ves sel through a valve.
' Under these conditions, the foam contained curds of coagulated latex. Pipes and valves at-' tached to the pressure vessel were coated on the inside and at places almost clogged with this coagulated latex. About one third of the latex charge ooasulated in the bomb.
Carbon dioxide dissolves in water under pressure; carbonic acid has little or no eflect on either synthetic or natural latices. However, un-
4 latices are especially satisfactory. The polyvinyl chlorides as is known are vinyl esters termed in the trade as "Vinylite and are members of a class of resinous thermoplastics possessed of rubbery characteristics.
It will be understood that I desire to comprehend within my invention such modifications as may be necessary to adapt it to varying conditions and uses.
Having fully described my invention'what I claim as new and desire to secure by Letters Patent is:
1. A composition for producing sponge rubber comprising an aqueous dispersion of a rubber selected from the group of natural rubber, polychloroprene latex, polyvinyl chloride latex, polybutadiene latices and mixtures thereof, a small amount of a vegetable oil as a plasticizer, from substantially l to 2.3 percent of a heat sensitizer selected from the group consisting of sodium silioo fluoride and calcium formate, impregnated. with nitrous oxide at a pressure of from 80 to 250 lbs., said composition being maintained at approximately 40 to 41 F. and having the property to expand upon release from a container into a rubber foam.
2. The composition of claim 1 in which the :aqueous dispersion of rubber is natural rubber tex.
3. A composition for producing sponge rubber comprising an aqueous dispersion of a mixture comprising polyvinyl chloride, a small amount of vegetable oil as a plasticizer, from substantially 1 to 2.3% of a heat-sensitizer selected from .the group consisting of sodium silicojluoride and calcium jormate, impregnated with nitrous oxide der pressure, this weak acid can react with enough of the sodium hydroxide in synthetic latex or ammonium hydroxide in natural latex to cause coagulation. When carbon dioxide isbubbled through latex, enough of the stabilizing hydroxide is converted to the carbonate to cause coagulation. Thisunexpectedresultwiththeuseofnitr oxide has indicated that nitrous oxide is the only gas suitab1e'ior4oaming latices by releasing the pressure required to dissolve the gas in the latex.-
I have found that this foamed latex, after being injected into the mold and committed, can be cured in hot water or with steam or by the application oi infrared heat.
Therefore, nitrous oxide is the only common gas which is suitable for producing foamed latex becauseothercommoninertgasesaretooinsolubleinthelatex.
While natural as well as sypthetic rubbers or their mixtures are applicable for the invention, polychloroprene sold as neoprene, polyvinyl chlorides. polyvinylidene and polybutadiene to 41 F. and having the property to expand upon release from a container into a rubber loam.
WILLIAM R. STAUFFER.
References Cited'in the file of this'patent or the original patent UNITED STATES PATENTS Number Name a Date 1,746,596 Knox Feb. 11, 1930 1,828,481 Trobridge et a1. --0'ct. 20, 1931 2,126,273 Ogilby 9, 1938 2,183,857 Tarkington Dec. 19, 1999 9 2,211,429 Mueller- Cunradi et al. Aug. 13, 1940 2,278,441 Harrison et a1. Apr. 7, 1942 2,288,190 Harrison June 30, 1942 2,319,675 Grinter May 18, 1943 2,921,111 Stamberger -i- June 8, 1943 2,325,637 Stewart Aug. 3, 1943 2,371,707 Rainier et a1 -L.-- Mar. 20, 1945 2,386,995. Wigal Oct. 16, 1945-
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US32717A US2567950A (en) | 1948-06-12 | 1948-06-12 | Sponge rubber composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| USRE23697E true USRE23697E (en) | 1953-08-04 |
Family
ID=21866446
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US23697D Expired USRE23697E (en) | 1948-06-12 | Sponge rubber composition | |
| US32717A Expired - Lifetime US2567950A (en) | 1948-06-12 | 1948-06-12 | Sponge rubber composition |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US32717A Expired - Lifetime US2567950A (en) | 1948-06-12 | 1948-06-12 | Sponge rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| US (2) | US2567950A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2802796A (en) * | 1953-02-09 | 1957-08-13 | Jr Harry A Toulmin | Process for producing a porous vinyl ester |
| US3215646A (en) * | 1962-05-11 | 1965-11-02 | Shell Oil Co | Method of foaming an olefin copolymer containing ethylene |
| US6011076A (en) | 1998-07-09 | 2000-01-04 | Flexible Products Company | Latex foam |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU31575A1 (en) * | 1951-11-17 | |||
| US2666036A (en) * | 1953-11-02 | 1954-01-12 | Elastomer Chemical Corp | Methods of producing a cellular structure in a plasticized vinyl ester resin |
| US2885372A (en) * | 1956-03-29 | 1959-05-05 | Mildred M Kelly | Continuous process for foaming rubber latices |
| BE754584Q (en) * | 1959-12-07 | 1971-01-18 | Globe Union Inc | |
| US3141003A (en) * | 1960-05-26 | 1964-07-14 | Diamond Alkali Co | Aqueous solution of stereoregular polyvinyl alcohol; method of making same; foams, fibers, and films obtained therefrom |
| US3107224A (en) * | 1960-06-13 | 1963-10-15 | Goodyear Tire & Rubber | Combustion resistant rubber latex foam containing a hydrocarbon mineral oil and a reinforcing styrene polymer |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1746596A (en) * | 1926-05-14 | 1930-02-11 | Knox Products Company | Method of making compound wall structures |
| US1828481A (en) * | 1929-05-28 | 1931-10-20 | Dunlop Rubber Co | Method of making articles from organic dispersions |
| US2126273A (en) * | 1936-08-13 | 1938-08-09 | Us Rubber Prod Inc | Method of making sponge rubber |
| US2325637A (en) * | 1938-06-23 | 1943-08-03 | Theodore A Te Grotenhuis | Formation of porous rubber products |
| US2278411A (en) * | 1939-06-26 | 1942-04-07 | Groov Pin Corp | Screw |
| US2288190A (en) * | 1940-01-25 | 1942-06-30 | Goodrich Co B F | Method of making sponge rubber |
| US2319675A (en) * | 1940-07-20 | 1943-05-18 | Goodrich Co B F | Loading patch for stress-testing aircraft |
| US2321111A (en) * | 1941-01-16 | 1943-06-08 | Int Latex Corp | Process for forming foam rubber and products thereof |
| US2371707A (en) * | 1942-05-27 | 1945-03-20 | Us Rubber Co | Nitrogen generating chemicals |
-
0
- US US23697D patent/USRE23697E/en not_active Expired
-
1948
- 1948-06-12 US US32717A patent/US2567950A/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2802796A (en) * | 1953-02-09 | 1957-08-13 | Jr Harry A Toulmin | Process for producing a porous vinyl ester |
| US3215646A (en) * | 1962-05-11 | 1965-11-02 | Shell Oil Co | Method of foaming an olefin copolymer containing ethylene |
| US6011076A (en) | 1998-07-09 | 2000-01-04 | Flexible Products Company | Latex foam |
| US6194479B1 (en) | 1998-07-09 | 2001-02-27 | Flexible Products Company | “Latex foam” |
Also Published As
| Publication number | Publication date |
|---|---|
| US2567950A (en) | 1951-09-18 |
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