C-stage

EDOC, available on the Questel host from INPI, is unique among non-Japanese language databases in including information on C-stage Japanese patents, ie, those that have successfiiUy weathered the pregrant opposition period and been sealed as patents under pre-1966 patent law. It also contains some information on patent family relationships from the period long before the advent of patent family databases. 

Air and oil filters are made by a dry-web process in which the filter paper is dried over heated metal dmms. The paper is saturated with the phenoHc resin solution, either off- or on-line, and dried in an oven advancing the resin to the B-stage (semicured). The sheet, containing 20—30% resin, is roUed and shipped to the filter-unit manufacturer, where the sheet is convoluted and the filter assembled and cured to the C-stage (fully cured). 

The resins used in air and oil filters are moderate-to-low molecular weight, catalyzed by caustic in one step 10—20% alcohol is added soHds content is in the range of 50—60%. These resins are designed to penetrate the sheet thoroughly, yet not to affect the porosity of the paper. In the B-stage, the resin must have sufficient flexibiHty to permit pleating the C-stage should have stiffness and resistance to hot oil. 

Fig. 3. Multiple fixed-bed configurations (a) adiabatic fixed-bed reactor, (b) tubular fixed beds, (c) staged adiabatic reactor witb interbed beating (cooling),...

C-stage Final reaction stage of various thermosetting resins. In this... 

The kinetic curve has a sigmoidal shape and can be intuitively divided into four stages (a) induction period, (b) stage of accelerated hydroperoxide formation, (c) stage of retarded ROOH formation, and (d) stage with prevalence of ROOH decomposition after the point... 

Figure 4.1. Progression of concentration in reactors, (a) Batch (b) batch with preloading (c) staged (d) tubular flow. 

C stage org chem The final stage in a thermosetting resin reaction in which the material is relatively insoluble and infusible the resin in a fully cured thermoset molding is in this stage. Also known as resite. se, sta ... 

Isothermal cure of the B-stage neat resin to the C-stage cure. 

C-stage cure of the neat resin as a function of temperature and frequency. 

Figure 2. Sample geometry for B-stage to C-stage and post C-stage cure.

Post C-Stage Cure (Dynamic). Samples that were C-stage cured at lAO C for 2 hours were scanned in the DMTA as a function of temperature (-100°C to 200 C). Raw data of tan delta and E vs. temperature at 30 Hz for the -5 and +5 wt.% samples is shown in Figure 10. 

Table IV. Post C-Stage Curing of Neat Resin at the Stoichiometric Ratio of Epoxy to Amine...

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