wherein R is methyl, ethyl or phenyl and R is C1 C4 alkyl in the presence of an acid catalyst at a pH of less than 6 at 20° C. to 10° C. for 0.5 to 10 hours and with the addition of 0.2 to 2 moles of water per mole of the RO group bonded to the Si group, and causing condensation reaction for 0.5 to 10 hours by adding {HEAD ~ an alkaline material} to {TAIL ~ the reactin product} to adjust its pH to 7 to 8.5 
wherein R is methyl , ethyl or phenyl and R is C1 C4 alkyl in the presence of an acid catalyst at a pH of less than 6 at 20 ° C. to 10 ° C. for 0.5 to 10 hours and with the addition of 0.2 to 2 moles of water per mole of the RO group bonded to the Si group , and causing condensation reaction for 0.5 to 10 hours by adding { HEAD ~ an alkaline material } to { TAIL ~ the reactin product } to adjust its pH to 7 to 8.5
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH