The change in the structure of tyre cord use in recent years, in the form of an increase in the use of anid cord and the commencement of use of polyester cord, has required an improvement in the adhesive properties of dipping solutions. Production of BMVP-10Kh butadienemethylvinylpyridine latex, which was used to provide an acceptable level of adhesion properties in impregnated anid and polyester cord, ceased in 1997. Alternative latices were developed for tyre cord dipping-BNA-52 butadiene-nitrileamide [1], DBA-1 butadienebutylacrylate-methacrylamide [2] and dipping solutions based on a combination of these latices with the butadiene carboxyl-containing latex SKD-1s (for anid cord), and on these latices only (for polyester cord). In terms of adhesion properties, BNA-52 and DBA-1 latices are inferior to butadiene-styrene-2-vinylpyridine latex (BSVPL). This latex is not produced in Russia or other CIS countries. We therefore urgently need to find latices made from Russian materials with better adhesion properties than BNA-52 and DBA-1. A high adhesion capacity in latices may be attained by achieving the following conditions.

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Earlier analysis of imported tyres [1] showed the predominant use in the breaker of car and small lorry tyres of high-strength (HS) metal cord with fi laments of 0.25-0.30 mm diameter and of simple design (for example, 1 × 3) and special design (for example, 2 + 2), characterised by improved rubber mix fl ow between the wires. In the breaker (besides the fi nal layers) and carcass of lorry tyres, structures were used that ensured a high tensile load and fatigue life, and, in the fi nal breaker layers, type HE cord with increased elongation at break

Cord used in the carcass of high-speed car tyres must possess a high modulus, fatigue strength, and low shrinkage. These requirements are satisfi ed by polyester cord, which has a considerably higher modulus, lower shrinkage, and a satisfactory fatigue strength, albeit lower than in the case of nylon-66 cord. Therefore, in recent years, the consumption of polyester cord has increased continually both abroad [1] and in Russia.

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