Various SiSiB alkylalkoxy silane have been used as components in Ziegler-Natta Polymerization Catalyst Systems.

Different silane donors with differing organoalkoxy structures are used depending on the exact nature of the catalyst and the type of polypropylene being manufactured. Organic substituents, such as cyclohexyl, cyclopentyl, methyl, isobutyl and phenyl, are some of the organic groups attached to silicon. The alkoxy groups are either methoxy or ethoxy with one, two, or three alkoxy groups on the silane molecule.

The following list shows all commercially available silane donors of PCC.

• Benefits
• Increase yield of polymer per unit weight of catalyst.
• Increase isotactic content of polypropylene-based polymers.
• Improve molecular weight dispersity of the polymer.

SiSiB® CODE	CHEMICAL NAME	CAS NO.
SiSiB® PC5931	PROPYLTRIMETHOXYSILANE Hydrophobing & dispersing agent.	1067-25-0
SiSiB® PC8132	PHENYLTRIETHOXYSILANE (DONOR-A)	780-69-8
SiSiB® PC8221	DIPHENYLDIMETHOXYSILANE (DONOR-B)	6843-66-9
SiSiB® PC9500	CYCLOHEXYLMETHYLDIMETHOXYSILANE (DONOR-C)	17865-32-6
SiSiB® PC9510	CDIISOBUTYLDIMETHOXYSILANE	17980-32-4
SiSiB® PC9520	DIISOPROPYLDIMETHOXYSILANE (DONOR-P)	18230-61-0
SiSiB® PC9530	DICYCLOPENTYLDIMETHOXYSILANE (DONOR-D)	126990-35-0
SiSiB® PC9540	ISOBUTYLISOPROPYLDIMETHOXYSILANE	111439-76-0