DE1939334B2 - METHOD FOR MANUFACTURING LAMINATE - Google Patents

Description

40 levels are not the creation of a flexible intermediate

materials require, so can rigid plastic layers by the simultaneous application of heat and Pressure on the stacked plastic sheets is generated who

The invention relates to a method of manufacturing in which a liquid polymer intermediate New kind of laminated objects with a 45 layer that forms the elastomeric intermediate material, ever-variety of plastic layers or plastic film, which nevertheless continued on the hard resinous material exerts a hardening effect by interposing a hard, rigid resinous material.

Materials are connected to one another, which is used by the mixture used in the invention-jn

Reaction of dihydroxy or dicarboxy-substituted polydiene prepolymers have free vinyl groups tem 1,2 polybutadiene or 3,4 polyisoprene, a po- 50 changing carbon atoms of the backbone carbon functional organic chain extender, and fabric chain, which preferably at least 80% represent a free radical-forming peroxide initiator er the olefinic unsaturated state, is procreated. These laminates are stable and flexible and preferably have a molecular weight of about at 500 to about 3000 until they are heated to elevated temperatures. The preferred polydene whereupon they become rigid and hard. 55 diene is 1,2-polybutadiene, although 3,4-polyisoprene

The thermosetting, cross-linked cyclized poly is also suitable. Difunctional compounds, the resin, which is characterized as an interconnection adhesive which is characterized by terminal substitutes, used according to the invention, belongs to the Fa- are preferred, although other polyfunctional nature of the resins, which by the cross-linked, linear prepolymers with functional groups closely extended chain. 'Cyclized aliphatic groups', o the opposite finds of the molecule, are marked, however, according to the invention. not necessary on the lindpositioncn. who uses already proposed polyester copolymers. Polyether the can. Although a dihydroxy substituted copolymer. Hydrocarbon copolymers and is generally preferable in prepolymers, namely plasticized forms just as well as already used mainly in the link to the easy reaction, suggested KcUenausdchner and free radicals ₍ , other, polydicnischch prepolymer with chemical

According to the state of the art, P.'astikfilm are functional groups, preferably at the end of structures either made of thermoplastic material, also unsatisfactory c.

939334

The selection of a suitable organic chain extender depends on the functional groups the prepolymers. If the functional groups on the prepolymers are hydroxyl groups, then should the chain extenders be diisocyanates, diacid halides, diacids or diesters. If the functional If groups on the polymers are carboxyl groups, the chain extenders should be diepoxides, diimines, and diols and be diaziridenes. The aliphatic or aromatic organic chain extenders are preferred difunctional, but can contain more than two functional groups. Important for the treatment stages of the process are the aliphatic and aromatic free radical forming peroxide initiatorsa These peroxide initiators are instrumental in cyclizing the pendant vinyl groups on the polydiene and useful in interconnecting adjacent chains. The peroxide initiator is in the initial mixture together with the polydiene prepolymer and the organic chain extender introduced, whereupon it is molecularly dispersed over the resulting elastomeric polymer. When applying of heat in the final step, the peroxide initiator breaks down to create free radicals fen, which force the attached vinyl groups to join, condensed to cross-linked to form cycloaliphatic chains.

In the manufacture of these resins, the polyfunctional organic chain extender should be used in one approximate stoichiometric ratio to the poly diene prepolymer are mixed. There are settings required if other additives, for example in the form of copolymeric or internal polymers Plasticizers are used, but are approximately stoichiometric ratios of the organic Chain extender over the prepolymer to add the preferred amounts. The peroxide is generally used in an amount within the range of 0.5 to 10 percent by weight of the prepolymer, preferably within the range of 2 to 6%, use det. Greater or lesser amounts of the peroxide can be used. The optimal amount depends, among other things, on the particular peroxide initiator used, the polydiene prepolymer used and the chain extender chosen for the reaction.

Preferably after mixing the additives, the polymer liquid should be degassed in vacuum, to remove trapped air and volatile contaminants. A chain expansion reaction proceeds at room temperature or moderately elevated temperatures to form an intermediate elastomeric material to produce, in which the free radical bi! the peroxide initiator is molecularly dispersed. the Chain extension reaction can be catalyzed to adjust the reaction temperature or reaction time to be reduced by catalytic additives, which are described below. While the polymer Binding itself in its elastomeric state, it can be easily handled and processed in terms of manufacture will. When the final article is made, the intermediate rubbery product is heated in the range of 65 to 205 "C, whereupon cycling and cross-linking occurs to to produce a hard, rigid and transparent laminate.

ίο A setting of the procedural conditions can by adding carefully selected substances. The treatment time, the viscosity, the machinability and the product properties can by Inclusion of one or more substances are changed, which act as a solvent or catalyst.

Laminated structures are produced by wetting the plastic film or sheet with the liquid form of the polymer achieved, either by

2 «direct application or through a solution with a solution carrier. The wetted plastic webs or films are compressed or -ge rolls, and the intermediate layer is brought into the elastomeric form by treatment; it can too separate polymer-coated plastic sheets until they have reached the elastomer shape for later assembly treatment and treatment. These layer structures have a long service life and are flexible, so that they are subsequently brought into numerous predetermined shapes prior to solidification the can.

While any film or sheet can be used in the present invention, they are preferred those with a flexible character are used. Foils or sheets made of polyethylene, fluorinicr are preferred tes ethylene propylene, ethyl cellulose, nylon, polytri fluorochloroethylene copolymers, polypropylene, polyester Terephthalate, polytetrafluoroethylene, polyvinyl chloride and copolymers, polycarbonates and polyimides.

If this plastic material is to be used with the elastomer are layered, they result in a flexible laminated structure, which before solidifying over a Shaped object can be bent or hung. Layer structures according to the invention can be used for almost all applications can be used with conventional laminated articles. Certain Properties such as improved chemical resistance, improved thermal stability and improved machinability lead to further favorable properties, as they are in known la mellied objects cannot be found. Additional can be lent decorative laminated layer structures by including colored paper as one layer of the layered structure. Such

η layer structures are, for example, as a construct tion elements can be used for suitcases, wall cladding or furniture.

Claims (3)

1 2 claims: or made of thermosetting plastic material. Both substances have certain disadvantages. The thermoplastic 1. Process for the production of laminates stic fabrics which are used in layers Plastic sheets by applying a den are hard and difficult to be hot-hardened before heating Apply glue to the plastic balls 5. Only if the thermoplastic nen. Folding of the coated webs of fabrics are kept in the hot flexible stage, and hardening of the layer structure in which it can be bent and given the desired shape Form by heating, thereby being brought about. Furthermore, once the character had to be identified, that a thermoplastic object was made on the webs, heat mixes that from (I) a polydiene with io are carefully avoided in order to avoid distortion of the at least two hydroxyl or carboxyl groups to avoid final shape. and avoid having free vinyl groups on alternating thermosetting plastic layer structures Carbon atoms of the polymer chain, (2) a certain difficulty, for example the hot chain extenders with at least two with the work and the use under heat. However, π reactive hydroxyl or carboxyl groups affect other disadvantages of the use of Groups and (3) from a radical peroxide thermosetting plastic. As a thermosetting plastic initiator consists; that thereupon a reaction substances from the liquid polymeric additive in between the polydiene and the chain extension, the machinability is before the end rer under such conditions made the act difficult. To make a laminate with inter Initiator remains unaffected; and that the web 2 layers are made of thermosetting material Laying them one on top of the other and putting them into the gel under pressure, it would be necessary to cover the plastic sheets with flussi Desired shaped layer structure to be coated in polymeric additives, what how Licher way hardens by heating. derum extensive special treatment and fabrica 2. The method of claim 1, wherein the poly would require tion processes. which has hydroxyl groups, thereby marked 25. Plastic laminated objects according to the inventor draws that as a chain extender you can become an ali- dation by coating plastic sheets Use a phatic or aromatic compound with a polymeric mixture that is poly det, which two isocyanate groups, two acid-functional prepolymers, of which at least one logenide groups, two carboxylic acid groups or a polyfunctional polydiene with a free vinyl group contains two ester groups. jo pen on alternating carbon atoms on one 3. The method of claim 1 or 2, wherein elongated backbone carbon chain is a poly the polydiene contains carboxyl groups, thereby functional organic chain extenders and characterized in that a free radical-forming peroxide initiator is used as a chain extender an aliphatic or aromatic compound behaves. This mixture is allowed to react to applies, the two epoxy groups, two Amingrup- 35 an elastomeric coating on the plastic sheets pen to form two hydroxyl groups or two aziridine groups, and they become plastic laminated groups having. objects successively by adhering the ge stacked plastic sheets generated with the simultaneous application of heat and pressure. If the process