Use of reactive prepolymeric organic compounds

Details Use of reactive prepolymeric organic compounds Use of reactive prepolymeric organic compounds

1998-09-30

2000-10-17

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Compositions to be polymerized by wave energy wherein said...

522 96, 522 90, 522 91, 522108, 523500, 526346, C08F 246, C08F 248

Patent

active

061333379

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to the use of reactive prepolymeric organic compounds for crosslinking, with or without free-radical initiators, by means of heat, high-energy radiation or heat and high-energy radiation.
Substances of this kind can be reacted, ie. polymerized further or cross-linked, using high-energy radiation, preferably UV light, or by means of free radicals at room temperature, using known combinations of peroxides and co-initiators, for example heavy metal salts, or by means of heat, using thermal free-radical initiators such as peroxides, azo initiators or C-C-labile compounds. These methods of initiating reaction can also be used in any desired combination, with possibilities including both the combined use of thermally generated free radicals with UV-generated free radicals and reaction to a B-stage, ie. a partially reacted state at which the reaction is terminated and can be reinitiated at a later point in time.
These reactive prepolymers may find application as paint binders, as coating compositions, for the preparation of compact or cellular, reinforced or nonreinforced molding compounds, casting compositions, electrical-insulation compositions, daylight-curable roadmarking paints, sealants and coating compositions, or as printing ink binders, binders for nonwovens, adhesives, prepregs, etc.
Unsaturated polyester resins containing dihydrodicyclopentadiene (DHCPD) structural units, which resins are generally used dissolved in monomeric reactive diluents such as styrene, .alpha.-methylstyrene, vinyltoluene, allyl phthalate, acrylates, vinylates or the like, are the subject of numerous patents. The use of these reactive diluents, which in the case of, for example, powder coatings may also be solid substances, is regarded in the prior art as being essential, owing to the inadequate homopolymerizability of the maleic and fumaric acid double bonds.
DE 31 07 450 relates to unsaturated polyesters which have oligomers of cyclopentadiene as end groups and can be used, as solutions in ethylenically unsaturated monomers, for preparing moldings and coatings; the use thereof without reactive diluents, however, cannot be derived from this document.
EP 101 585-A relates to unsaturated polyester resins which are modified by the addition of cyclopentadiene onto the double bond of the polyester and are then dissolved in vinyl monomers.
EP 118 786-A describes unsaturated polyester resins which are modified with dicyclopentadiene and, dissolved in vinyl or allyl monomers, are cured in a two-stage process to give molding compounds offering high temperature stability.
EP 260 688-A also relates to polyester resins, which are dissolved in vinylic monomers.
DE 32 30 924-A describes a special process for preparing polyester resins which contain cyclopentadiene structures and are dissolved in vinyl monomers.
EP 585 74 2-A relates to mixtures of solid substances containing unsaturated polyester resins and polyurethane acrylate resins. These mixtures are suitable as powder coatings which, after being melted, are crosslinked under UV light in the presence of UV initiators.
EP 0 684 284-A1 describes synergistic mixtures of unsaturated polyether ester resins and dicyclopentadiene polyester resins, which are dissolved in styrene and are cured in the presence of peroxidic catalysts.
DE-A-15 702 73 describes polyesters whose ends carry 5- or 6-membered imide rings, derived for example from tetrahydro-phthalimidoethanol, and are dissolved in unsaturated monomers.
The present invention provides for the use of reactive prepolymeric organic compounds, containing structural units having at least one readily abstractable hydrogen with a bond energy of not more than 397 kJ/mol and having at least one ethylenic double bond, for crosslinking, with or without free--radical initiators, by means of heat, high-energy radiation or heat and high-energy radiation.
Preferred such compounds are those whose readily abstractable hydrogens are a to a double bond (allylic hydrogens), and especially those whose readily abstractable hydroge

REFERENCES:
patent: 4801629 (1989-01-01), Stavinoha et al.
patent: 5319006 (1994-06-01), Yang et al.
patent: 5620751 (1997-04-01), Brindoepke et al.

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