Examples are a cyclic acetal
named Vulkazon AFS and an enol ether named Vulkazon AFD.
Protonation of the hemi-acetal
hydroxyl, followed by the loss of water, produces an oxonium ion which quickly attacks the adjacent hydroxyl on PVOH to yield the cyclic acetal
A properly packed out acetal
part produced at the correct mold temperature will exhibit continued shrinkage of about 0.
The traditional route of using halogenated FR systems is not an option with acetals
because of the violent reaction that these polymers undergo with any chlorinated or brominated substances.
Other new Delrin acetal
resins make possible the injection molding of flat shapes and large parts without the warp problems associated with standard acetals
performance in automotive fuels was recently illustrated in a series of 5000-hr comparison tests.
Dry color, color concentrates and compounds for PE, PS, PP, ABS, SAN, PC, nylons, NAS, K-Resin, acrylics, urethanes, butyrate and acetals
Its stiffness, strength, and toughness are similar to standard medium-viscosity acetals
Also, a full slate of new engineering resins at K 2004 are weighted toward nylons, acetals
, polyesters, and TPEs tailored for improved processability, aesthetics, and specialized functional properties.
DuPont also unveiled platable and paintable Delrin acetals
and high-temperature Zytel HTN nylons.
101); polyethersulfone sulfone (PESS), a novel high-temperature resin from Gharda Chemicals of India; decorationfriendly and warp-resistant acetals
from DuPont Engineered Plastics, and electrically and thermally conductive compounds from PolyOne.