hide-coupon-for-x-products.php

<?php

add_filter( 'woocommerce_coupons_enabled','ts_hide_coupon_field_on_cart' );
function ts_hide_coupon_field_on_cart( $enabled ) {

	$product_ids = array(8, 55, 57);
	$count = 0;
	$cart = WC()->cart->get_cart();
	foreach ( $cart as $id => $cart_item ) {
		if( in_array( $cart_item[ 'data' ]->get_id(), $product_ids ) ) {
			$count++;
		}
	}	

	if( $count == count($product_ids ) ) {
		$enabled = false;
	}
	return $enabled;
}