Anti-curling

The biaxially oriented film has an excellent anti-curling property. The anti-curling property means that a film hardly remains curled when rolled once and then unrolled. Whitening has rarely been observed at a fold when the film is folded. This property is called delamination resistance and is an important index for the evaluation of both a base film for a magnetic recording medium and a base film for a photo film. 

The usage of a PEN film for a photo film is more satisfactory with respect to mechanical strength, dimensional stability, and in anti-curling property when rolled to a small diameter. However, the PEN film is susceptible to delamination, especially when the film is rolled and perforated. The occurrence of delamination makes it difficult to use it as a base film of a photo film because a delaminated portion is whitened. 

Finally, CTA films play an important role in optical applications due to their anti-curl property and their low in-plane birefringence even when the polymer is oriented in combination with high transmittancy (as PMMA), low haze (better than PMMA), and a refractive index of 1.48 [44], Anti-curl is basically a bad shape memory when rolled off from the storage roll, a requirement for the colour negative film, the only left application of CTA film in the category of photography. 

The biaxially oriented film has an excellent anticurling property. The anti-curling property means that a film hardly remains curled when rolled once and then unrolled. Whitening has rarely been observed at a fold... 

A h erbranched polyesteramide may be used as an anti-curl agent (59). This compound may be present in the ink in amounts less than conventional anti-curl agents and still effectively control curl without detrimentally affecting intercolor bleed control, water-fastness, or drying. Consequently, the ink composition does not exhibit increases in viscosity and problems associated therewith, that occur in ink composition using conventional anti-curl agents. The s mthesis of h5q)erbranched poisoners has been described in detail (60,61), and is shown in Figure 3.34. 

It has also been proposed to use 1,3-diols, 1,3,5-triols, amino-1,3-diols, or hydroxyamide derivatives as anti-curl agents in the ink in order to suppress curling (56). 

A/,A/-Bis(2-hydroxyethyl)-glycine Figure 3.35 Anti-curling agents (56). 

Hyperbranched poly(ester amides) (anti-curl agent) (59) ... 

P. janczewskii as an anti-fungal metabolite with a particular curling effect on the hyphae of the plant pathogen, Botrytis allii. The structure of griseofulvin... 

Fig. 4.4 Cryostat. Use a cryostat to cut sections from tissue frozen on a chuck, (a) The chamber of a cryostat with the frozen tissue indicated by the black arrow. This tissue was frozen in a rectangular mold, (b) The chuck with the tissue is placed in the arm. (c) The excess O.C.T. is trimmed off with a razor blade by cutting into the block several times, (d). The trimmed frozen O.C.T. is removed with a razor blade cut from the top of the block, (e) The knife is adjusted into position very close to the block, but not touching. The block is advanced toward the block until sections are cut. (f) The anti-roU plate prevents cut sections from curling, (g) An alternative to the anti-roll plate is to use a fine paint brush to hold a section as it comes off the block, (h) Sections are picked up on microscopes slides, (i) Lower the bottom of the slide until the section attaches then warm the slide, (j) When the section is dry, remove the dried film of O.C.T. arrows) with a forceps. Note the two rows of sections toward the slide label down) have the film already removed...

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