Document NeO9N4YEZXv6DBp8QLVZqx66b

.-6112, SXKA-0121 uary, i960 The BAKELITE Brand fibrouv s retina are newv physical forms of thermoplastics. The fibers are very irregular in structure with many ine\fibrils-extending out from the main fiber bundle. Diameters vary from 2 Vo 200^microns, apd lengths range from vary short to a maximum of 3/16 inch. Currently^available resins, include a vinyl.copolymer, VXKA-6112, and a polystyrene, SXKA-0121. \ ^^ \ \" \\ ' \ The fibrous resins offer an attractive means 'for economically incorporating ther moplastic resins in paper. ' \\ v '\ 1. Their structure is similar to cellulosic fiber. i \2. They are easily incorporated in pa^er in existing equipment, j3. It is not necessary to lower tt}e pH ^s,.wt$ liquid VesinffV5'' ' 4. There is good retention on the wire and little lobs \in white water. V 5'. The prices of the Fibrous Resins e^e rei^tih \ Vs*-" The BAKELITE Brand Fibrous Resins appear to have appllc^tAorTTn the preparation of specialty papers, in laminates, and paper arm pulp molding. T^ere are also possibilities for their use as "binders for non-woven textiles which dm^fed"produced on paper making equipment. Laboratory studies of these applicktionsArdreported in the following sections. Fibrous Resin Impregnated Paper Paper Production Stook was prepared by furnishing the fibrous resin together with one-tenth its weight of wood pulp to a hollander-type beater, and beating until the desired fiber size was obtained. The remainder of the wood pulp was added and beaten until the desired freeness was obtained. Initial beating time was about the same as that required to beat 100$ wood pulp from 660 to 400 Canadian freeness under the same beater setting. RECIVl0 : ~ t ** rc 1 The recommendofiont, fef retulli, property values, ond sufiSettiont ore offered here<n ot a guid< the use of these material* and ore not o guor^me* of the<r performance. The property volvct given ore ihote to be expected in the product o' the 1 ne of monufoOwre. There *oluei ore dependent jiDon the testing method* os inducted Properties mote cer'oin to be reolired oie meotured wi letter Ifrel*wenfty u^ol where mfji foituting operofion* ere closely controlled. H Application* require cont<nwol erifpco*'on of o c discussed with o Union Carbide P'o*:-c* Technicol Represento*!** Union Carbide Ploi>a Comi ^!rTf'T1 firt0o1rAttv'or Wootr*ieV recVrementt should be ^fTTTifr wTai >d *0 *. -4- Press cycles for the fibrous resins give improved efficiency since the cure time is considerably lower. In laboratory runs, cure time for the fibrous resins was 6 minutes, compared with 20 minutes for the phenolics. There are further possibilities for shorter press cycles. The packs to be laminated could be heated outside the press and pressed between cold platens for extremely fast cycles, or it may prove possible to laminate by a continuous calendering.operation, Water absorption of the fibrous resin laminates is high compared with phenolic laminates. Surfacing both faces with 4-mil vinyl film reduces the value to about 5 per cent which approaches the phenolic values. Sizing agents, rosin for example, may improve this property. Fibrous Resin Paper Molding Fibrous resin creped papers can'be compression molded to form structures curved in three dimensions. Creped paper is necessary in order to obtain deep draws. Low pressure molded items have a paper-like surface while those pressed at several thousand psi experience complete flow-out of resin and exhibit a hard glossy surface. Fibrous Resin Pulp Molding While both vinyl and styrene fibrous resins have been evaluated for pulp molding, only the styrene is recommended for further test because- of the temperatures, around 350F., employed in this process. A two-step process has been found desirable. The pulp is first die dried under a pressure of 100 psi, then further pressed at 1250 psi. Re sults of one series of tests on the styrene resin in a slurry of unbleached kraft, rag and wood fibers are given below: SXKA-0121 , $ _o__________ g_________ 25_________50 Flex. Strength, pbI. Tensile Str., psi. 3000 3800 5400 6150 7250 6400 8900 4700 Water Absorp., $ 90 76 37 10 Fibrous Resin-Asbestos Papers and Laminates Asbestos fibers have been combined with fibrous resins by conventional wet hanashei processes without difficulty. These sheets may be laminated directly to cardboard oi^wo< without use of an adhesive, by a hot pressing operation. \ Typical properties of SXKA-0121 laminates are as follows: Flexural Strength psi x 103 M.O.E. psi x 106 Tensile Strength psi x 103 Water Absorption, $ Resin, 5$-C-l Asbestos, 95$ Resin, 25$-C-l Asbestos, 75$ 10.2 1.03 0.3 3-4 125 16 Resin, 50$-C-l Asbestos, 50$ 12.6 l.o4 7.1 1-3