Self-sealing elastomer composition for a pneumatic object
An elastomer composition having a self-sealing property includes: a blend of at least two solid elastomers, in which “elastomer A” is a polybutadiene or butadiene copolymer elastomer, in which “elastomer B” is a natural rubber or synthetic polyisoprene elastomer, and in which an elastomer A:elastomer B weight ratio is within a range from 10:90 to 90:10; between 30 and 90 phr of a hydrocarbon resin, with phr meaning parts by weight per 100 parts of solid elastomer; and from 0 to less than 120 phr of filler, which includes from 0 to less than 30 phr of reinforcing filler. The composition may be used to form a puncture-resistant layer in an inflatable article, such as a tire. The puncture-resistant layer may be used in combination with an airtight layer to form an airtight and puncture-resistant laminate for the inflatable article.
1. An inflatable article comprising a puncture-resistant layer, wherein the puncture-resistant layer is formed of a composition that includes:
a blend of at least two solid elastomers,
an “elastomer A” including a polybutadiene or butadiene copolymer elastomer, and
an “elastomer B” including a natural rubber or synthetic polyisoprene elastomer,
wherein the elastomer A:elastomer B weight ratio is within a range of from 10:90 to 90:10;
between 30 and 90 phr of a hydrocarbon resin, with phr meaning parts by weight per 100 parts of solid elastomer; and
from 30 to 120 phr of filler, which includes less than 30 phr of a reinforcing filler.
2. The inflatable article according to claim 1 , wherein the puncture-resistant layer has a thickness of greater than 0.3 mm.
3. The inflatable article according to claim 2 , wherein the puncture-resistant layer has a thickness of between 0.5 mm and 10 mm.
4. The inflatable article according to claim 1 , wherein the puncture-resistant layer is positioned on an internal wall of the inflatable article.
5. The inflatable article according to claim 1 , wherein the inflatable article is an article made of rubber.
6. The inflatable article according to claim 5 , wherein the inflatable article is a tire.
7. The inflatable article according to claim 1 , further comprising an airtight layer, wherein the puncture-resistant layer in combination with the airtight layer forms a self-sealing and airtight laminate.
8. The inflatable article according to claim 7 , wherein the airtight layer includes butyl rubber or a thermoplastic styrene elastomer.