摘要:
1) Procédé de préparation d'un polyuréthane à blocs polyuréthane-polyéther et polyuréthane-polyester avec au moins 2 blocs terminaux polyuréthane-polyester reliés à un groupe terminal alkoxysilane, ledit procédé comprenant: (i) la réaction d'un polyéther polyol (A) avec un excès stoechiométrique d'un diisocyanate aliphatique (B), puis (ii) la réaction du polyuréthane formé à l'étape (i) avec un excès stoechiométrique d'un polyester polyol (C), puis (iii) la réaction du polyuréthane formé à l'étape (ii) avec une quantité stoechiométrique d'un isocyanatosilane (D).
2) Polyuréthane formé par ledit procédé 3) Composition adhésive correspondante, comprenant en outre un catalyseur de réticulation. 4) Procédé d'assemblage de 2 substrats mettant en oeuvre ladite composition.
摘要:
The invention relates to an adhesive composition that can be cross-linked by heating, said composition comprising between 20 and 85 % of a polyurethane comprising 2 terminal groups of the hydrolysable alkoxysilane type of formula (I) : wherein: R 1 is a hydrocarbonated radical comprising between 5 and 15 carbon atoms; R 2 is an alkylene radical comprising between 1 and 4 carbon atoms; R 3 is an akylene radical comprising between 1 and 3 carbon atoms; R 4 and R 5 are each an alkyl radical comprising between 1 and 4 carbon atoms; n is a whole number such that the average molar mass of the polyether block of formula -[OR 2 ]n- is between 300 Da and 30 kDa; m is a whole number such that the average molar mass of the polymer of formula (I) is between 600 Da and 60 kDa; and p is a whole number equal to 0, 1 or 2. The composition also comprises between 15 and 80 % of a compatible tackifying resin; and between 0.01 and 3 % of a cross-linking catalyst. The invention also relates to a self-adhesive carrier coated with the cross-linked adhesive composition.
摘要:
Hot-melt pressure-sensitive adhesive (HMPSA) composition comprising: a) from 25 to 50% of a styrene block copolymer chosen from the group comprising SIS, SIBS, SEBS and SEPS copolymers; b) from 35 to 75% of a compatible tackifying resin that has a softening point between 80 and 150°C and an acid value less than 20; c) from 0.5 to 20% of one or more carboxylic acids, of which the hydrocarbon-based chain comprises from 6 to 54 carbon atoms. Multilayer system comprising a layer of HMPSA, a printable support layer and an adjacent protective layer. Corresponding self-adhesive label and method of recycling a labelled article with removal of said label by immersion of the article in a hot basic aqueous solution.
摘要:
An adhesive composition comprising a two-component system comprising A) at least one polyester urethane containing at least two isocyanate groups, which polyester urethane may be obtained by reaction of one or more polyesters 1 with aliphatic diisocyanates and reaction with one or more polyesters 2, wherein polyester 1 exhibits a number average molecular weight Mn in the range from 3,000 to 7,000 g/mol and polyester 2 exhibits a number average molecular weight Mn in the range from 700 to 2,000 g/mol (determined by gel permeation chromatography, polystyrene gel crosslinked with divinylbenzene as the stationary phase, tetrahydrofuran as the liquid phase, polystyrene standards) and B) one or more branched polyesters with a number average molecular weight Mn in the range from 1,000 to 3,500 g/mol (determined by gel permeation chromatography, polystyrene gel crosslinked with divinylbenzene as the stationary phase, tetrahydrofuran as the liquid phase, polystyrene standards) and optionally one or more conventional additives; the present invention provides a polyurethane-based adhesive composition which is suitable for the production of laminates for sterilizable packaging and exhibits a low residual content of highly volatile diisocyanates. The adhesive according to the invention ensures that no or only slight delamination of the film composites occurs even at elevated temperatures.
摘要:
1) Film multicouche comprenant 2 couches minces liées par une couche d'épaisseur inférieure à 10 µm d'une composition adhésive comprenant : - de 30 à 70 % d'un mélange de copolymères blocs styréniques consistant de 5 à 75 % d'un copolymère tribloc choisi dans le groupe comprenant les SIS, SIBS, SBS, SEBS et SEPS, et de 25 à 95 % d'un copolymère dibloc choisi dans le groupe comprenant les SI, SBI, SIB, SB, SEB, SEP, la teneur en motifs styréniques globale dudit mélange étant comprise entre 10 et 40 % ; et - de 30 à 70 % d'une ou plusieurs résines tackifiantes.
2) Procédé de préparation dudit film comprenant une étape d'enduction par la composition adhésive d'une première couche mince de matériau, dans laquelle ladite composition, rendue coulable par chauffage à une température appropriée, est extrudée par un dispositif d'enduction sans contact avec ladite couche mince, sous la forme d'une couche substantiellement continue, qui est ensuite mise en contact avec la surface de ladite couche mince.
摘要:
The invention relates to hot-coextrudable thermofusible self-adhesives that are particularly suitable for producing multi-layer films intended to be used for easy-to-open and easy-to-reclose repositionable packaging containers. Said adhesives comprise a mixture of a styrene block copolymer and a compatible tacky resin having a high melt viscosity and a traction resistance force at 1 m.s . included in the area located below the polynomial curve defined by y = - 2.82.10 .x + 5.92.10 .x 4.97.10 .x +2.15.10 .x 4.99.10 .x + 6.26.10 .x + 4.71.10 wherein the y ordinate represents the constraint which is expressed in MPa and x, abscissa, represents the deformation which is expressed in %.
摘要:
The present invention provides copolyester compositions and novel methods employing such compositions. The copolymer compositions comprise a copolyester containing a low polarity block in the copolyester backbone, thereby resulting in adhesive and coating materials that exhibit improved flow and wettability and superior initial adhesion and retained adhesion to various substrates.