Extended sealing gels, process for production therof and use therof in sealing compounds for self-sealing tyres

Patent metadata

Field	Value
Publication number	US-11020915-B2
Application number	US-201816477768-A
Country	US
Kind code	B2
Filing date	Jan 25, 2018
Priority date	Jan 26, 2017
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

A sealing compound comprising an inventive extended sealing gel, a process for producing this sealing compound, the use of sealing gels in sealing compounds, and the use of sealing gel-containing sealing compounds in tyres

First claim

The invention claimed is:

1. A sealing gel for self-sealing tyres
i) in the form of a mixture comprising a diene rubber gel (A) formed by emulsion polymerization of at least one conjugated diene in the presence of at least one crosslinker (I) and a second diene rubber gel (B) formed by emulsion polymerization of at least one conjugated diene in the presence of at least one crosslinker (II), or
ii) formed by emulsion polymerization of at least one conjugated diene in the presence of at least one crosslinker (I) and/or in the presence of at least one crosslinker (II), wherein:
the at least one crosslinker (I) are selected from: acrylates and methacrylates of polyhydric C 2 -C 20 alcohols, and
the at least one crosslinker (II) are selected from: compounds having two or more vinyl, allyl or isopropenyl groups or maleimide unit, wherein
the sealing gel further comprises an extender compound incorporated therein, and wherein said extender compound is a liquid elastomer, a lubricant oil, a factice and/or mixtures thereof, and wherein
said sealing gel has a Mooney viscosity (ML1 +4) @100° C. of 30 to 90 MU, determined by the standard ASTM D1645(1999), and wherein the at least one conjugated diene is selected from: 1,3-butadiene, and wherein the sealing gel has a proportion of cis-1,4-butadiene units of 8% to 17% by weight, a proportion of trans-1,4-butadiene units of 59 to 75 % by weight and a proportion of 1,2-vinylbutadiene units of 17% to 21% by weight, wherein all weight percentages are based on incorporated 1,3-butadiene.

2. The sealing gel according to claim 1 , wherein: said sealing gel has a Mooney viscosity (ML1+4) @ 100° C. 40 to 85 MU, determined by the standard ASTM D1646(1999).

3. The sealing gel according to claim 1 , wherein the diene rubber gel (A) has a Mooney viscosity (ML1+4) @ 100° C. of 170 MU to 195 MU and the diene rubber gel (B) has a Mooney viscosity (ML1+4) @ 100° C. of 75 MU to 110 MU, wherein the Mooney viscosity is determined by the standard ASTM D1646(1999).

4. The sealing gel according to claim 1 , wherein further monomers are polymerized in the emulsion polymerization of the at least one conjugated diene, wherein said further monomers are selected from: 1,3-butadiene, vinylaromatics, styrene, 2-methylstyrene, 3-methyl styrene, 4-methyl styrene, α-methylstyrene, 2,4-dimethyl styrene, 2,4-diisopropylstyrene, 4-tert-butyl styrene or tert-butoxystyrene, acrylonitrile, isoprene, esters of acrylic acid and methacrylic acid, tetrafluoroethylene, vinylidene fluoride, hexafluoropropene, 2-chlorobutadiene, 2,3-dichlorobutadiene, carboxylic acids containing double bonds, acrylic acid, methacrylic acid, maleic acid ,itaconic acid, hydroxyl compounds containing double bonds, hydroxyethyl methacrylate, hydroxyethyl acrylate or hydroxybutyl methacrylate, amine-functionalized (meth)acrylates, glycidyl methacrylate, acrolein, N-vinyl-2-pyrrolidone, N-allylurea, N-allylthiourea, secondary amino (meth)acrylates, 2-tert-butylaminoethyl methacrylate, 2-tert -butylaminoethylmethacrylamide, and/or vinylic heteroaromatics.

5. The sealing gel according to claim 4 , wherein the further monomer is styrene and wherein said emulsion polymerization is occured at 5° C. to 20° C.

6. The sealing gel of claim 1 , wherein:
the at least one crosslinker (I) is selected from the group consisting of:
acrylates and methacrylates of ethylene glycol, propane-1,2-diol, butane-1,4-diol, hexanediol, polyethylene glycol having 2 to 8 oxyethylene units, neopentyl glycol, bisphenol A, glycerol, trimethylolpropane, pentaerythritol, sorbitol with unsaturated polyesters of aliphatic di- and polyols and mixtures thereof.

7. The sealing gel of claim 6 , wherein:
the at least one crosslinker (I) is selected from the group consisting of:
acrylates and methacrylates of propane-1,2-diol, butane-1,4-diol, neopentyl glycol, bisphenol A, glycerol, trimethylolpropane and pentaerythritol.

8. The sealing gel of claim 1 , wherein:
the at least one crosslinker (I) is trimethylolpropane trimethacrylate (TMPTMA).

9. The sealing gel of claim 1 , wherein
the at least one crosslinker (II) is selected from the group consisting of:
diisopropenylbenzene, divinylbenzene (DVB), divinyl ether, divinyl sulphone, diallyl phthalate, trivinylbenzene, triallyl cyanurate, triallyl isocyanurate, 1,2-polybutadiene, N,N′-m-phenylenemaleimide, tolylene-2,4-bis(maleimide) and triallyl trimellitate and mixtures thereof.

10. The sealing gel according to claim 1 , wherein: the extender compound is at least one of a paraffinic oil, a hydrogenated or non-hydrogenated naphthenic oil, an aromatic or DAE (Distilled Aromatic Extracts) oil, a MES (Medium Extracted Solvates) oil, a Treated Distillate Aromatic Extracts (TDAE) oil, a mineral oil, a vegetable oil and/or oligomers and mixtures of said oils.

11. The sealing gel according to claim 1 wherein: the extender compound is a lubricant oil based on polybutene.

12. A sealing gel for self-sealing tyres
i) in the form of a mixture comprising a diene rubber gel (A) formed by emulsion polymerization of at least one conjugated diene in the presence of at least one crosslinker (I) and a second diene rubber gel (B) formed by emulsion polymerization of at least one conjugated diene in the presence of at least one crosslinker (II), or
ii) formed by emulsion polymerization of at least one conjugated diene in the presence of at least one crosslinker (I) and in the presence of at least one crosslinker (II), where
crosslinkers (I) are acrylates and methacrylates of polyhydric C 2 -C 20 alcohols; and
crosslinkers (II) are compounds having two or more vinyl, allyl or isopropenyl groups or one maleimide unit,
wherein the sealing gel further comprises an extender compound incorporated therein, and wherein
said extender compound is a liquid elastomer, a lubricant oil, a factice and/or mixtures thereof wherein
said sealing gel has a Mooney viscosity (ML1+4) @100° C. of 30 to 90 MU, determined by the standard ASTM D1646(1999), and wherein the at least one conjugated diene is selected from: 1,3-butadiene, and wherein the sealing gel has a proportion of cis-1,4-butadiene units of 8% to 17% by weight, a proportion of trans-1,4-butadiene units of 59% to 75% by weight and a proportion of 1,2-vinylbutadiene units of 17% to 21% by weight, wherein all weight percentages are based on incorporated 1,3-butadiene.

13. The sealing gel of claim 12 , wherein:
the crosslinker (I) is selected from the group consisting of:
acrylates and methacrylates of ethylene glycol, propane-1,2-diol, butane -1,4-diol, hexanediol polyethylene glycol having 2 to 8 oxyethylene units, neopentyl glycol, bisphenol A, glycerol, trimethylolpropane, pentaerythritol, sorbitol with unsaturated polyesters of aliphatic di- and polyols, and mixtures thereof.

14. The sealing gel of claim 12 , wherein:
the crosslinker (I) is trimethylolpropane trimethacrylate (TMPTMA).

15. The sealing gel of claim 12 , wherein:
the crosslinker (II) is a compound selected from the group consisting of:
diisopropenylbenzene, divinylbenzene (DVB), divinyl ether, divinyl sulphone, diallyl phthalate, trivinylbenzene, triallyl cyanurate, triallyl isocyanurate, 1,2-polybutadiene, N,N′-m-phenylenemaleimide, tolylene-2,4-bis(maleimide) and triallyl trimellitate and mixtures thereof.

16. The sealing gel according to claim 12 , wherein the extender compound is factice.

17. Sealing compounds exhibiting improved adhesion and cohesion properties comprising a sealing gel according to claim 1 .

18. Sealing compounds comprising:
at least one sea

Assignees

• Arlanxeo Deutschland Gmbh

Inventors

• Zhou Jiawen
• Früh Thomas
• Thust Torsten

Classifications

• C09J109/06

  Copolymers with styrene · CPC title

• B29C73/163 Primary

  Sealing compositions or agents, e.g. combined with propellant agents · CPC title

• C08J3/075

  Macromolecular gels · CPC title

• C08J2309/06

  Copolymers with styrene · CPC title

• C09J109/00

  Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons · CPC title