Sika Technology Ag

Doreen Janke

Kai Paschkowski

Martin Linnenbrink

Urs Burckhardt

Mario Slongo

Martin Schmider

Mathias Cordes

Dirk Urbach

Björn Funke

Andreas Günther

Kathrin Bien

A hot-melt glue composition, including a) at least one atactic poly-&#x3b1;-olefin (APAO) that is solid at 25&#xb0; C.; b) at least one hydrocarbon resin having a softening point of at least 80&#xb0; C., measured in accordance with the ring-and-ball method according to DIN EN 1238; and c) at least one maleic-anhydride-grafted wax having a softening point of not more than 150&#xb0; C., measured in accordance with the ring-and-ball method according to DIN EN 1238, which is a maleic-anhydride-grafted polypropylene wax or a maleic-anhydride-grafted polyethylene wax, wherein the proportion of the at least one maleic-anhydride-grafted wax in the hot-melt glue composition is at least 3 wt %. The hot-melt glue composition is characterized by a low reactivation temperature, together with high heat resistance and good adhesion to ABS and nonpolar polyolefin materials. The hot-melt glue composition is well suited for film lamination by vacuum deep-drawing lamination, in particular for applications in automobile construction.

Polyolefin hot-melt glue having a low reactivation temperature and high heat stability and use thereof for vacuum deep-drawing lamination

A moisture-cured hot-melt adhesive can be formulated as a PUR-HM that is R-40 classification-free and stable during storage and processing, having a residual monomer content of less than 1 wt. % and having good cross-linking density and full-curing speed. The hot-melt adhesive is particularly suitable for vehicle construction in industrial manufacture, in particular of automobiles, in the textile or furniture industry or in the packaging industry.

Polyurethane hot-melt adhesive having a low content of diisocyanate monomers and good cross-linking speed

A hot melt adhesive composition is provided which contains at least one silane group-containing thermoplastic poly-&#x3b1;-olefin which is solid at 25&#xb0; C. and at least one paraffin wax. The hot melt adhesive composition has only low adhesion to uncoated aluminum tool surfaces, wherein at the same time they have high final strengths and thermal stabilities comparable to conventional adhesives, as well as good resistance to environmental influences. The hot melt adhesive is suitable as a laminating adhesive for laminating films made of thermoplastic olefins, which have sufficient stability for subsequent deep-draw lamination.

Reactive polyolefin hot melt adhesive with low adhesion to uncoated aluminum tools and use thereof as a laminating hot melt

The invention relates to a process for sealing an above-ground or underground construction. In particular it involves the use of non-reactive hot melt adhesives and flexible polyolefin films. This procedure in particular has the advantages that good and long-lasting adhesion can be achieved very quickly, and that in particular by using polyolefin strips coated with non-reactive hot melt adhesives, insulating strips can be obtained simply which are non-tacky at room temperature and can be processed and bonded easily at the construction site.

Use of polyolefin membranes being coated by non-reactive hotmelt adhesives for sealing

The present invention relates to laminates of a plasticizer-containing plastic, obtained by bonding by means of a moisture-reactive hot-melt adhesive which comprises at least one aldimine and at least one polyurethane polymer which contains isocyanate groups and is solid at room temperature. The bonded assembly is notable for improved adhesive, particularly following heat/moisture storage or alternating storage. Preferred embodiments of such laminates are bonded films or film-laminated supports, the film preferably being a pPVC film.

Laminates joined by polyurethane hot-melt adhesive and process for bonding plasticizer-containing plastics

A hot melt adhesive composition including a) at least one thermoplastic silane grafted poly-&#x3b1;-olefin that is solid at 25&#xb0; C.; and b) at least one reaction product of a polyisocyanate having an isocyanate-reactive silane, wherein the isocyanate-reactive silane includes exactly one group reactive to an isocyanate group, selected from a hydroxyl group, a mercapto group, and an amino group, and wherein the reaction product includes a molecular weight Mof less than 1500 g/mol.

Hot melt adhesive compositions having good adhesion on both polar and nonpolar substrates

Use of polyolefin sealing films coated with non-reactive hot-melt adhesive for sealing

Methods of using an aldimine of formula (I) as cleaning agent or ingredient of a cleaning agent composition for reactive polyurethane compositions, especially for reactive polyurethane hot melt adhesives. It has been found that such cleaning agents can greatly reduce the quantity of wastes and in particular mixtures of blocked and nonblocked reactive polyurethane compositions can be used without problem for gluing, without the gluing being negatively influenced in its properties, especially its thermal stability.

Aldimine cleaning composition for reactive polyurethane compositions

The present invention relates to innovative amorphous polyurethane polymers of the formula (I) and also to hotmelt adhesive compositions based on them. The compositions are notable for greatly improved dimensional stability after application, and are ideally suited to the adhesive bonding of transparent substrates. The polymers are notable for rapid, bubble-free curing.

Amorphous polyurethane polymer and its use in hotmelt adhesives

The invention relates to relates to moisture-hardened hot melt adhesive which contains at least one polyurethane polymer of formula (I) which comprises aldimine groups and which is solid at room temperature, in addition to at least one polyurethane polymer P which comprises isocyanate groups, if q in formula (I) represents zero, or if X in formula (I) represents N&#x2014;Rwith Ras a substituent of formula (III). The compositions are characterised in that contain visibly less isocyanate monomers and are therefor particularly advantageous from a work-hygiene point of view.

Growing community of inventors

Alveslohe, Germany

Doreen Janke