Patent ID: 8557900

Claim:
A water-based cement for producing tyres, comprising water as solvent, a cross-linkable unsaturated-chain polymer base, sulphur, reinforcing filler, zinc oxide, accelerators; said cement being characterized by comprising an emulsifier of the general formula (I) [R 1 R 2 R 3 NR 5 (N(R 4 ) 3 ) n ] (n+1)+ (n+1)X − (I) where: X is an anionic atom or group; R 1 , R 2 and R 3 , which may be the same or different, are each C m H 2m+1 , where m ranges between 1 and 3, or CH 2 CHCH 2 or CHCHCH 3 ; R 4 is CH 2 CHCH 2 or CHCHCH 3 ; n is 0 or 1; R 5 is an aliphatic group C 15 -C 22 when n is 0; and is an aliphatic group C 8 -C 16 when n is 1; when n is 0, at least one of R 1 , R 2 , R 3 and R 5 comprises a double bond.