I am using ConvertTo-Csv to get comma separated output
ConvertTo-Csv
get-process | convertto-csv -NoTypeInformation -Delimiter \",\"
It out
Here is a way to remove the quotes
get-process | convertto-csv -NoTypeInformation -Delimiter "," | % {$_ -replace '"',''}
But it has a serious drawback if one of the item contains a " it will be removed !
"