Resist solubility

Great chemical resistance Solubility—solvent castable... 

Several types of diisocyanates (aromatic, aliphatic, cyclo aliphatic) and many different glycol-chain extenders (open-chain aliphatic, cyclo aliphatic, aromatic aliphatic) can be used to produce TPU-elastomer hard segments. In the more conventional and practical formulations only a single diisocyanate component is used to make a TPU, so the diisocyanate is common to both the hard and soft segments. The polymer chemist makes his diisocyanate and glycol-chain-extender component selections based on such considerations as desired TPU mechanical properties, upper service temperature, environmental resistance, solubility characteristics, and economics. 

Chemical resistance soluble in concentrated strong acids... 

The polymers employed to formulate today s deep UV positive resists are predominantly 4-hydroxystyrene copolymers (Fig. 31), which has resulted from realization that only a small amount of a protecting group can make the resin insoluble in aqueous base. For example, as mentioned earlier, more than 90% deprotection is needed to render the fBOC resist soluble in aqueous base, meaning that 10% protection sufficiently reduces the dissolution rate of PHOST. Thus, the partial protection approach has overcome the problem associated with the much faster dissolution rate of PHOST than novolac resins in aqueous base and allowed one to make chemical amplification positive resists compatible with the industry standard 0.263 N TMAH developer which had been selected for the... 

Corrosivity indicator tests normally used to evaluate BA or BS are pH, electrical resistivity, soluble chloride content, and soluble sulfate content. Materials are judged to be noncorrosive if the pH exceeds 5.5, the electrical resistivity is... 

Unlike other amorphous resins has good Chemical resistance. Soluble in aprotic solvents, methylene chloride and trichloroelhane 0.28%... 

Halogenated hydrocarbons - no resistance soluble dichloromethane Teriuran, BASF... 

Several variables are known to have an influence on corrosion rates in soil these include water, degree of aeration, pH, redox potential, resistivity, soluble ionic species (salts), and microbiological activity. The complex nature of selected variables is presented graphically in Fig. 10.2 [2]. 

Solvent resistance Soluble some aromatics Unaffected below Unaffected below... 

D543 Solvent resistance Soluble in some aromatics above 60 °C Soluble in some aromatics above 60 °C Unaffected below 80 °C Unaffected below 80 °C ... 

Generally, an increase in butyryl content increases flexibility, moisture resistance, solubility and compatibility with resins as the butyryl content increases, hardness, tensile strength and heat resistance decrease. Cellulose... 

Soivents organic 0 Poor resistance soluble in aromatic and chlorinated hydrocarbons Polymethylpentene (PMP) RTP 3000... 

Poor resistance soluble in ketones and esters aromatic and chlorinated hydrocarbons... 

As we have seen earlier, the choice and level of monomers used in the backbone, control basic film characteristics such as hardness, chemical resistance, solubility, flexibility and exterior durability. These will be discussed below under individual application headings. In general, however, the polymers ate formulated to give glass transition temperatures (Tg) of between 30 and 100°C+ with the harder, less flexible copolymers at the top end of the range, and the coatings with greater flexibility at the lower end. 

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