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 {HEAD ~ 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 {TAIL ~ condensation reaction} for 0.5 to 10 hours by adding an alkaline material to 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 { HEAD ~ 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 { TAIL ~ condensation reaction } for 0.5 to 10 hours by adding an alkaline material to 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH