US3748297A - Polychloroprene gasket-forming compositions containing as a rheologyaffecting additive, 2-mercaptobenzothiazole - Google Patents
Polychloroprene gasket-forming compositions containing as a rheologyaffecting additive, 2-mercaptobenzothiazole Download PDFInfo
- Publication number
- US3748297A US3748297A US00137638A US3748297DA US3748297A US 3748297 A US3748297 A US 3748297A US 00137638 A US00137638 A US 00137638A US 3748297D A US3748297D A US 3748297DA US 3748297 A US3748297 A US 3748297A
- Authority
- US
- United States
- Prior art keywords
- mercaptobenzothiazole
- gasket
- polychloroprene
- compounds
- parts
- 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 - Lifetime
Links
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 title abstract description 14
- 239000000203 mixture Substances 0.000 title description 32
- 229920001084 poly(chloroprene) Polymers 0.000 title description 15
- 239000000654 additive Substances 0.000 title 1
- 230000000996 additive effect Effects 0.000 title 1
- 150000001875 compounds Chemical class 0.000 abstract description 31
- 239000000443 aerosol Substances 0.000 abstract description 12
- 229920001971 elastomer Polymers 0.000 abstract description 12
- 239000000945 filler Substances 0.000 description 13
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 11
- 229920000642 polymer Polymers 0.000 description 11
- 239000007788 liquid Substances 0.000 description 10
- 239000004615 ingredient Substances 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 239000004014 plasticizer Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- -1 alkyl thiuram disulfides Chemical class 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 238000000540 analysis of variance Methods 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000013023 gasketing Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000003380 propellant Substances 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- RLPSARLYTKXVSE-UHFFFAOYSA-N 1-(1,3-thiazol-5-yl)ethanamine Chemical compound CC(N)C1=CN=CS1 RLPSARLYTKXVSE-UHFFFAOYSA-N 0.000 description 1
- YBRVSVVVWCFQMG-UHFFFAOYSA-N 4,4'-diaminodiphenylmethane Chemical compound C1=CC(N)=CC=C1CC1=CC=C(N)C=C1 YBRVSVVVWCFQMG-UHFFFAOYSA-N 0.000 description 1
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229920008716 Darex Polymers 0.000 description 1
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 241000276489 Merlangius merlangus Species 0.000 description 1
- UTGQNNCQYDRXCH-UHFFFAOYSA-N N,N'-diphenyl-1,4-phenylenediamine Chemical compound C=1C=C(NC=2C=CC=CC=2)C=CC=1NC1=CC=CC=C1 UTGQNNCQYDRXCH-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 1
- ZFMQKOWCDKKBIF-UHFFFAOYSA-N bis(3,5-difluorophenyl)phosphane Chemical compound FC1=CC(F)=CC(PC=2C=C(F)C=C(F)C=2)=C1 ZFMQKOWCDKKBIF-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
- MIMDHDXOBDPUQW-UHFFFAOYSA-N dioctyl decanedioate Chemical compound CCCCCCCCOC(=O)CCCCCCCCC(=O)OCCCCCCCC MIMDHDXOBDPUQW-UHFFFAOYSA-N 0.000 description 1
- AUZONCFQVSMFAP-UHFFFAOYSA-N disulfiram Chemical compound CCN(CC)C(=S)SSC(=S)N(CC)CC AUZONCFQVSMFAP-UHFFFAOYSA-N 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 150000002357 guanidines Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000002917 insecticide Substances 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- IVSZLXZYQVIEFR-UHFFFAOYSA-N m-xylene Chemical group CC1=CC=CC(C)=C1 IVSZLXZYQVIEFR-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012169 petroleum derived wax Substances 0.000 description 1
- 235000019381 petroleum wax Nutrition 0.000 description 1
- PVFZKRMYBKEXBN-UHFFFAOYSA-N piperidine;piperidine-1-carbodithioic acid Chemical compound C1CCNCC1.SC(=S)N1CCCCC1 PVFZKRMYBKEXBN-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 125000003698 tetramethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229960002447 thiram Drugs 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/14—Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
- C08K5/47—Thiazoles
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/02—Inorganic compounds
- C09K2200/0239—Oxides, hydroxides, carbonates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/02—Inorganic compounds
- C09K2200/0243—Silica-rich compounds, e.g. silicates, cement, glass
- C09K2200/0252—Clays
- C09K2200/026—Kaolin
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/04—Non-macromolecular organic compounds
- C09K2200/0488—Sulfur-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0607—Rubber or rubber derivatives
Definitions
- a typical aerosol unit is composed of a hollow cylindrical container closed at one endand provided with an opening at its opposite end for receiving a dispensing valve assembly.
- a metal mounting cup serves as a 010- sure for the container and also as a support for the valve assembly which is tightly fitted within an aperture centrally located in the cup.
- the mounting cup carries an annular gasket adapted at its outer edge to be crimped to the walls forming the opening in the container and thereby form a seal upon crimping.
- the gasketing material used in aerosol mounting cups must be elastic and resilient. It must be capable of yielding under deforming forces to establish a satisfactory seal when the cup is crimped to the container. It must also be capable of maintaining the seal during normal storage periods. Often selected for this function are gaskets prepared from solvent-based rubber compositions which comprise an elastomer dissolved in a volatile organic solvent. The compositions may also contain pigments, fillers, curing agents and other conventional compounding ingredients. Because of superior resistance to oxidation and to oils and propellants as well as to various other chemicals commonly found in aerosol containers, neoprene (a chlorobutadiene polymer) has become the favored elastomer in this type of composition.
- a band of the fluid composition is deposited in the annular channel of the mounting cup while the cup is being rotated beneath a metering nozzle through which the composition flows to form a continuous annular deposit. This deposit is subsequently converted into a dry solid elastomeric sealing mass by expulsion of the solvent and cured at elevated temperatures.
- compositions that can benefit from the present invention consist essentially of a polymer of 2-chloro-1,3- butadiene dissolved in a volatile organic solvent.
- the elastomeric polymer may be either a homopolymer of the chloroprene or a copolymer containing minor quantities of styrene, acrylonitrile, isoprene and other monomeric units copolymerizable with it.
- chloroprene polymers are commonly referred to as neoprenes and are commerically available as general-purpose types, such as GN, GNA, GRT, W, WRT and WHV. Any general purpose neoprene may be used alone or in admixture.
- special purpose neoprenes such as KNR, CG and AC, may be used in combination with general-purpose types.
- the chloroprene polymer may be dissolved in a single volatile organic liquid or in mixture of such liquids able to function together as solvent medium.
- Preferred usable organic liquids in this capacity are those that have a minimum boiling point of 230 F., as well as mixtures of liquids that do not boil below 230 F. and yet are capable of volatilization in the course of the overall drying and curing cycle to which the gasketing compounds are subjected.
- Illustrative of this type of liquids are toluene, xylene, a high boiling petroleum solvent such as Solvesso wtih a boiling range of 230 F. to 345 R, an aliphatic petroleum solvent such as Varsol #1 which boils between 320 F. and 390 F., and mixtures of such liquids.
- the volatile Organic liquid selected is used in quantities such that compositions having a total solids concentration between about 40 and 50% by weight, and preferably between about 45 and 50% by weight, are obtained.
- the total solids portion of the compositions includes the combined weight of polymer, fillers, curing mixture and the other substantially non-volatile ingredients employed.
- the amount of the polymer in the composition should be at least about 21% of the weight of the total composition.
- the curing agent may be a metallic oxide such as magnesium oxide, zinc oxide, a lead oxide, or mixtures of elemental sulfur with a metallic oxide. About 1 to 15 phr. of curing agent is generally used, any excess over that level acting as filler. Preferably, a mixture of oxides is used that contains about 4 phr. of a light or extra light calcined magnesia per 5 phr. of zinc oxide, such a mixture providing relatively rapid and complete cure with minimum scorching.
- a curing accelerator may be used in conjunction with the oxides, e.g. Z-mercaptoimidazoline or p,p'-diaminodiphenylmethane.
- compositions may include a non-volatile liquid plasticizer in quantities ranging between about 0 and 20 phr.
- plasticizers facilitate mixing of the polymer with other ingredients such as fillers and also enhance the sealing characteristics of the resulting gasket.
- the plasticizer is used at a level not greater than phr.
- Illustrative plasticizers include dioctyl sebacate, dioctyl adipate, didecyl phthalate, dioctyl phthalate, naphthenic oils or any relatively non-volatile liquid plasticizing material conventionally used as processing aid for neoprene rubber.
- inorganic fillers While the presence of inorganic fillers is not essential in the present compositions, their use in sealing aerosol containers tends to reduce the permeability of the gasket to propellants. Fillers are also helpful in modifying the specific gravity and flow characteristics of the fluid com position. Suitable fillers include hydrated calcium silicate, fine sized Whiting, talc, silicon dioxide and clays. The quantity of filler may range between about 0 and 100 phr. Quantities ranging between about 30 and 70 phr. are preferred, the exact quantity used depending upon the filler or combination of fillers selected, the characteristics imparted to the fluid composition, and the properties desired in the cured gasket.
- Peptizers allow greater ease in adjusting the viscosity of the composition to a value within the range required for standard lining equipment.
- Typical eptizers include alkyl thiuram disulfides, e.g. tetramethyl and tetraethyl thiuram disul fides; piperidinium alkyl dithiocarbamates, e.g. piperidiniumpentamethylene dithiocarbamate; and guanidines.
- Peptizers are used in quantities preferably between about 0.5 and 6 phr.
- lubricants e.g. stearic acid and petroleum waxes
- antioxidants e.g. diphenyl-p-phenylenediamine and p-(p-tolylsulfonylamide)diphenylamine
- pigments e.g. carbon black, iron oxide and titanium dioxide.
- Example- 3 4 5 6 Fixed Ingredients (parts by weight):
- Polychloroprene (Neoprene GN)- 100 100 100 Paraflin wax 2.0 2.0 2.0 2. 0 Sodium acetate 1. 5 1. 5 1. 5 1. 5 Magnesium oxide 8. 0 8. 0 8. 0 8. 0 Tetraethylthiuram disulfide- 2. 5 2. 5 2. 5 2. 6 Piperidinium-pentamethylene dithiocarbarnat-e 2. 0 2. O 2. 0 2. 0 Zinc oxide 5. 0 5. 0 5. 0 5. 0 5. 0 Dioetyl 7. 4 7. 4 7. 4 7. 4 7. 4 Silica ge 0.1 0. 1 0. 1 0.1 Ziuce resinate O. 3 0. 3 0. 3 0. 3 Xylene 200 200 200 200 Variable ingredients (parts by weight):
- 2-mercaptobenzothiazole 2 2 Aluminum silicate (kaolin) 50 60 Calcium carbonate I 50 50 A Darex #9 ACF automatic compound lining machine for aerosol mounting cups was used in these tests. The machine was adjusted so that the compound of Example 5 was lined with lap bubbles. Then, without disturbing the lap setting of the machine, the compounds of Example 3, 6 and 4 were lined in that order. Approximately 300 cups were lined with each of the four compounds. The only variance used in lining each compound was the pressure used to regulate the quantity of material. This is necessary to achieve a substantially constant quantity of cured compound among all compounds. Enough of each compound was thus applied to give gaskets of 0.023 inch in thickness having the following film Weights: 605 mg., 625 mg., 625 mg. and 630 mg. for the compounds of Examples, 3, 4, 5 and 6 respectively. After lining, the compounds were put through a normal aerosol gasket curing cycle of 1 hour air drying, 1 hour heating at F., 1 hour at 250 F. and 1 hour at 325 F.
- a composition for forming flowed-in gaskets comprising, on a weight basis, 100 parts of a polymer of 2- chloro l,2-butadiene, between 0.5 and 6 parts of a peptizer, between 1 and 15 parts of a curing agent, between 0 and 20 parts of a non-volatile plasticizer for the polymer, between 0 and 100 parts of a filler, between 1.25 and 4 parts of Z-mercaptobenzothiazole, and sufficient volatile liquid hydrocarbon solvent, having a minimum boiling References Cited UNITED STATES PATENTS 3,389,113 6/1968 Simons et a1 26041.5 R 3,310,524 3/1967 Hurlock et a1. 26045.8 SN 3,220,968 11/1965 Dollhausen et a1. 2603 1.8 DR 2,802,811 8/1957 Somerville et a1. 26045.8 SN
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Sealing Material Composition (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13763871A | 1971-04-26 | 1971-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3748297A true US3748297A (en) | 1973-07-24 |
Family
ID=22478381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00137638A Expired - Lifetime US3748297A (en) | 1971-04-26 | 1971-04-26 | Polychloroprene gasket-forming compositions containing as a rheologyaffecting additive, 2-mercaptobenzothiazole |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3748297A (https=) |
| AU (1) | AU4156272A (https=) |
| CA (1) | CA966945A (https=) |
| DE (1) | DE2220174A1 (https=) |
| FR (1) | FR2136716A5 (https=) |
| IT (1) | IT956232B (https=) |
| ZA (1) | ZA722803B (https=) |
-
1971
- 1971-04-26 US US00137638A patent/US3748297A/en not_active Expired - Lifetime
-
1972
- 1972-04-17 CA CA139,856A patent/CA966945A/en not_active Expired
- 1972-04-25 ZA ZA722803A patent/ZA722803B/xx unknown
- 1972-04-25 DE DE19722220174 patent/DE2220174A1/de active Pending
- 1972-04-26 IT IT23528/72A patent/IT956232B/it active
- 1972-04-26 FR FR7214907A patent/FR2136716A5/fr not_active Expired
- 1972-04-26 AU AU41562/72A patent/AU4156272A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| IT956232B (it) | 1973-10-10 |
| FR2136716A5 (https=) | 1972-12-22 |
| ZA722803B (en) | 1973-02-28 |
| AU4156272A (en) | 1973-11-01 |
| CA966945A (en) | 1975-04-29 |
| DE2220174A1 (de) | 1972-11-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: W. R. GRACE & CO.-CONN., MASSACHUSETTS Free format text: MERGER;ASSIGNORS:GRACE MERGER CORP. A CT CORP. (MERGED INTO);W. R. GRACE & CO. A CT. CORP.;REEL/FRAME:005206/0001 Effective date: 19880525 |