Blends Containing Cellulose

Considerable research effort has been devoted to developing a new generation of disperse dyes designed to optimise fastness to washing and minimise cross-staining of the cellulosic component of polyester/cellulosic blends [97,98]. Diester-containing monoazo disperse dye structures (4.91) that yield a dicarboxylic acid on hydrolysis and certain thienylazo blues... 

The study was then extended to monitor the scale-up of a pharmaceutical blend containing an active pharmaceutical ingredient. A binary mixture of acetaminophen (APAP) with microcrystalline cellulose was selected as the model formulation. The ability of NIR spectroscopy to monitor real-time content uniformity in addition to the aforementioned compact attributes, during roller compaction was also tested. 

Dye Combinations. In certain cases it is desirable to print fiber blends with combinations of the appropriate dye classes, rather than with pigments. Only polyester-cellulose blends are of commercial importance and the following dye systems have been developed for them. The dyes of the different classes are contained in the same print paste and, therefore, are applied simultaneously in one print operation. They include disperse-reactive combinations, disperse-pigment combinations, and disperse-vat combinations. 

Metal specimens coated with the various blends were immersed in water in an accelerated test to determine the effect of high humidity. Cellulose acetate butyrate blends containing carboxylated polyesters prepared with hexahydroterephthalic acid [H(NPG), T50H(NPG)] were particularly susceptible to moisture and failed the adhesion test after immersion for only 0.5 hour similar blends containing T50I(NPG) extended with dianhydride Via or with PMDA passed the adhesion test after immersion for 16 hours. When coatings on cold-rolled steel of cellulose acetate butyrate (EAB-381-0.5) blends containing 1% of each of the... 

FKuR also introduced Biograde 200C in 2005, an unfilled cellulose blend with high stiffness and transparency for cast film and injection moulding. The material can also be blow moulded into bottles and thermoformed into cups and trays. Injection moulded Biograde 200C exhibits properties comparable to polystyrene, but with the addition of barrier performance comparable to PLA. It consists of 100% renewable resources, but does not contain starch. 

General purpose scouring agent especially suitable for the removal of severe staining. Not recommended for use on cellulose acetate or blends containing this fibre. 

The reactant-type crosslinking agents have hardly any influence on the handle of cellulosic textiles, the only exceptions being FIXAPRET CPU and BU. On blends containing more than 50% of polyester fibres, FIXAPRET PEC and CPN produce the softest handle. 

When applied to blends containing more than 50% of synthetic fibres, FIXAPRET CPU may impart a fuller handle. It produces a firm and resilient handle, particularly to fabrics composed of regenerated cellulose. 

Handbuilders for cellulosic and synthetic/cellulosic blends WARCOSET CHB polymer does not contain formaldehyde. When used with low formaldehyde resins it does provide a resilient finish on rayon and polyester/rayon blends similar to that obtained with high formaldehyde resins. WARCOSET CHB solution is compatible with most commonly used finishing agents. 

Somewhat similar results were obtained with cellulose graft/blend systems with PMA, PMMA and poly(2-hydroxyethyl methacrylate) [Nishioka and Yoshida, 1992] and could be correlated with the degree of compatibility. In one case the thermal stability of blends containing grafted cellulose was 100°C less than those without grafted product [Nishioka et al., 1993]. 

Mixtures of polar polymers, such as PVC, PC, PMMA, TPU, PA, PEST, PGI, SAN, or ABS could be compatibilized by incorporation of two copolymers, the first containing vinyl alcohol, the second an anhydride. For example, blends of TPU with Phenoxy, EVAl, COPO, modified cellulose, and/or polyalkylene oxide, had attractive physical, optical and barrier properties, and were melt-processable without degradation. They could be transformed into films, sheets, or bottles with good barrier properties. Blends containing PA were used for films, tubes, toys, gears, bearings, shafts, curtain sliders, door rollers, etc. The blends with elastomers were reported suitable for improved wiper blades [La Fleur et al., 1994]. 

Cellulose butyrate contains the bulkier butyryl group these esters are more compatible and soluble than acetates, but are too soft for most coating applications. Cellulose esterified with blends of alkyl groups can provide many intermediate properties needed in coatings. Selection of the appropriate cellulose acetate butyrate [9004-36-8] (CAB) and cellulose acetate propionate [9004-39-f] (CAP) content must be based on specific application requirements. 

Development of more comfortable blends containing progressively less cellulosic fiber. 

It has been concluded that the best properties could be obtained by processing a blend containing 18% cellulose for 30 min at 165°C. The hydrophilic and dielectric properties of polyethylene were altered. 

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