2010

The ring-opening polymerization (ROP) of trimethylene carbonate (TMC) initiated by water or n-pentanol and catalyzed by trifluoromethanesulfonic acid (HOTf) or methanesulfonic acid (MSA) has been investigated. In contrast with HOTf, MSA was found to afford poly(trimethylene carbonate) (PTMC) free of ether linkages even under forcing conditions. The comparison of the two acids substantiates further that activity does not simply correlate with acidity.

Rapid underwater bonding of clear polycarbonate to metal or plastic substrates at temperatures approaching 0 °C was studied. Bonding was achieved within minutes using ethyl 2-cyanoacrylate gel cured using the photoinitiator (dibenzoylferrocene) with a blue-LED light source. The optimum initiator concentration varied from 0.3% to 0.1 wt % for adhesive films 0.5 to 1.2 mm thick, respectively. The polymerisation rate shows a negative temperature dependence making it highly suitable for cold environments.

The present disclosure relates to a dyeing composition comprising, in an appropriate dyeing medium, at least one pigment and at least one electrophilic cyanoacrylate monomer of formula - in which R is chosen from alkyl radicals and alkoxyalkyl radicals. Dyeing kits comprising said compositions and processes using same are also disclosed.

The present invention relates to a cyanoacrylate-based adhesive composition containing (A) an +--cyanoacrylate, (B) a (meth)acryloyl group-containing multifunctional compound and (C) cumene hydroperoxide in which a content of cumene (1-methyl-1-ethylbenzene) is less than 5 wt%.

The present invention relates to toughened cyanoacrylate compositions.

A method for producing a purified 2-cyanoacrylate is characterized in that distillation is conducted in the presence of a polymerization inhibitor whose boiling point is within ±12° C. of the boiling point of the 2-cyanoacrylate. With this method, polymerization of 2-cyanoacrylate can be continuously prevented in the distillate system during distillation of a crude 2-cyanoacrylate, so that a purified 2-cyanoacrylate can be obtained.

The literature data on the application of organosilicon compounds as water scavengers in reactions of carbonyl com- pounds is surveyed. The reactions leading to both carbon–carbon (in particular, aldol-type condensations) and carbon–nitrogen bond formation, the synthesis of iminium salts by elimination reactions and heterocyclizations are considered.

The present invention relates to a polymerizable adhesive composition which comprises, at least as one constituent, a cyanacrylate component and which requires a comparitively short time for curing when used on surfaces. The present invention therefore also includes a method for the production of the cyanacrylate component described above, and the cyanacrylate component as such.

An adhesive composition includes one or more polymerizable cyanoacrylate monomers, a polymerization initiator and a polymerization accelerator for the one or more polymerizable cyanoacrylate monomers.

Here we report the preparation of mechanically robust silica aerogel polymer nanocomposites using surface-initiated atom transfer radical polymerization. This approach was used to grow poly(methyl methacrylate) (PMMA) with low polydispersities and establish the first structure–property relationship between the grafted PMMA molecular weight and bulk physical properties of the hybrid aerogel.