Document pp19jEq4zp4OZ4G22p6wyyr4E

777 ( SHELL CHEMICAL CORPORATION 380 MADISON AVENUE NEW YORK 17, N. Y. PLAINTIFF'S EXHIBIT SIM 028 TELEPHONE OXFORD 7-33TT October l, 1956 Director Forest Products Laboratory U. 8. Department of Agriculture Madison 5# Wisconsin -tXZTret; SHELL D'AJ.W-GNF CO. ^Wsfr,19*5 ml. re HAEDLE: Attention Hr. t. 8. Trues, Chief Division of Tinker Processing Oentlenent ^? Pleese refer to pour letter'of September 6 (filet BP-PL VADC JP4) which refers to the evaluation of epouy resin edhesives. BY: We regret that the necessity to obtain further technical infometion on the X-131 resin has caused us to delap this reply to pour letter. At thiar tine ve do not feel it desirable to recounend pour evaluating adhesive spsteas based 00 this resin. Our eoik to date has shown that adhesives containing the X-131 resin have good reslstasss to ogoing at 500*1 in hoods to stsialass steel, fcwier, the laltlsl tiurtli Shear strengths at rooa temperature ~or at elevated teepemtures Ard loV in cohperlson to other avail* able adheelves. Furthermore, the inherent brittleness of the eurod rosin results is low bend strength sad peel strength and poor reproducibility of bond performance. r j > ... Ve are actively engaged in foraulatUg XPOB adhesives based oa the X-131 reein la order to lapxove overall adhesive perforeance. At this tins, however, ve feel that none ef our adhesive formulations would be suitable for pour testing. Bsgarding SPOT Adhesive X, we have the following inforaatlon to give concerning general appllcation, curing end performance. In reviewing this data, a direct cenperisoa of our technical bulletin on Adhesive TXXX (copy attached) will psora helpful. The CL Curing Agent (metephniylenedianine) Is incorporated in the adhesive as follows 1 The adhesive paste should be warned to 1*5-150*? and 11-1*6 by weight of completely Ufusfiad CL Curing Agasi is added. The CL is melted at 150-160*?. The edheelva and curing agent Should bo stirred thoroughly x\to avoid local eolidiflcatloe of the CL. ^ * LAM 028995 ABS-018201 Forest Products Laboratory 2. Tbs recomaeoded curs schedule for Adbeeive X Involves 2/2 hour heating at 2Uo*F plus 1/2 hour at 330*7 at contact pressure or at pressure 19 to *2 pal. A postcurs of 3 hours at 330*7 Is essential for development of hot strength and peel resistance. IPO* Adhesive X should be handled vans (at 123-130*7) to give good spreading and the desired vetting properties. At lover tenperaturea the adhesive is sore viscous than KPQ* Adhesive TXXX. the pot life of the catalysed adhesive Is ouch shorter than that of IPO* Adhesive TXXX. 2a our work *e have found that the shear strength of JGPOiAdhesive X at 300*7 is significantly better than the strength of IPOf Adhesive TUX. Cooperative values are 2,000 pal vs. 500 pal. We trust the shove Information will prove wsful la your adhesive evaluation program. Please contact ue If ve can furnish additional Information. Tours very truly. Origin*) S'fsod By F. S. SWACKHAJMEft 7. f. Seachhaser, Manager Sesins k Plastics Sept attach. HAC/v be: Then Development Co./fir. T. P. Bradley UT8L, Director LAM 028996 ABS-018202