Ato Chimie

Patrick Borg

Gerard E Deleens

Serge Lombard

The present invention relates to a new thermofusible adhesive based on certain block copolyetheramides resulting from the copolycondensation of polyamide blocks with reactive extremities with polyether blocks with reactive extremities.

Block copolyetheramides-based thermofusible adhesive compositions

A process for measuring the adhesive power of pressure-sensitive adhesives, especially adhesive tapes or sheets; it is also related to a device for implementing this process. This process consists in causing a ball to fall freely onto the adhesive surface of the tape or sheet and exerting a vertical upwardly directed separating force upon the ball, the measurement of the adhesive power of the adhesive being a function of the time comprised between the instant when the separating force is initially exerted upon the ball and the instant when the ball returns to its initial starting point.

Measuring adhesive force

A process for manufacturing petroleum resins for adhesive thermofusible compositions, having a softening point comprised between 60.degree. and 110.degree. C., a molecular weight comprised between 700 and 1,500 and a Gardner color index less than 9, consisting in polymerizing a C.sub.5 hydrocarbon distillation cut issuing from a steam cracking of naphtha or gas-oil and containing less than 5% isoprene and less than 1% cyclopentadiene, in the presence of a Friedel-Crafts catalyst.

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Rueil-Malmaison, France

Patrick Borg