Gas line sealing method utilizing penetrating flexible sealant
AssigneeLoctite Corporation
InventorsSeamus M. Grant, Bernard Cooke, Kieran Mulcahy
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Abstract
A method of sealing leaking gas pipe joints by injecting a catalyzed acrylic monomer composition into the leaking joint and curing the composition in the joint to seal the leak is characterized in that the composition when cured has a glass transition temperature which is no more than 0.degree. C. and is at least about 5.degree. C. below the minimum pipe joint operating temperature. Suitable sealants are mixture of long chain monoacrylic esters, hydroxy functional acrylic esters, acid monomers, plasticizers and polyfunctional acrylic esters.
Claims18
In a method comprising injecting a catalyzed acrylic monomer composition into a leaking pipe joint and curing the composition in the joint to seal the leaks, the improvement comprising that the composition when cured has a glass transition temperature (Tg) which is not more than 0.degree. C. and is a least about 5.degree. below the minimum operating temperature of the pipe joint, and the composition has a viscosity no greater than 100 cps.
In a method comprising injecting a catalyzed acrylic monomer composition into a leaking pipe joint and curing the composition in the joint to seal the leaks, the improvement comprising that the composition when cured has a glass transition temperature (Tg) which is not more than 0.degree. C. and is at least about 5.degree. below the minumum operating temperature of the pipe joint, and the composition comprises:
- (a) 20-80% of a long chain acrylic ester;
- (b) 15-50% of a hydroxy functional acrylic ester;
- (c) 0.5-5% of a acid monomer;
- (d) 5-30% of a plasticizer;
- (e) 0.1-5% of a polyfunctional acrylic ester.
A flexible penetrating sealant for sealing leaks in gas-line joints characterized in that the sealant has a viscosity low enough to be injected into a leaking gas-line joint and comprises a mixture of a long chain acrylic ester, a hydroxy functional acrylic ester, an acid monomer, a plasticizer and a polyfunctional acrylic ester, and has a glass transition temperature (Tg) which is no more than 0.degree. C. and which is at least 5.degree. C. below the minimum pipe joint operating temperature.
Dependencies are inferred from the claim text.